How to use ExecuteScalar() to get a value and give it to your textbox.text?

this is my table:

CREATE TABLE [dbo].[InvoiceTable] (

    [Id]                 INT           IDENTITY (1, 1) NOT NULL,

    [CodeColumn]         NVARCHAR (50) NOT NULL,

    [NameColumn]         NVARCHAR (50) NOT NULL,

    [QTYColumn]          INT           NULL,

    [TotalQTYColumn]     INT           NULL,

    [UnitCostColumn]     INT           NOT NULL,

    [DiscountRateColumn] FLOAT (53)    DEFAULT ((0)) NULL,

    [RowTotalColumn]     AS            (([QTYColumn]*[UnitCostColumn])*((1)-[DiscountRateColumn])) PERSISTED,

    PRIMARY KEY CLUSTERED ([Id] ASC)

);

I have an Invoice form and a Confirimation form. User selects the desired goods in the first form and confirms how much he/she should pay in the second form. I want my program to show the value of sum(RowTotalColumn) as a text in my TotalCostTextBox.Text.
I wrote the following code:

private int ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();

    return int.Parse(result.ToString());

    TotalCostTextBox1.Text = result.ToString();

when I put TotalCostTextBox1.Text = result.ToString(); after return it yells

Unreachable code detected

when I put it before return, TotalCostTextBox1 shows nothing...

Please tell me how to fill the TotalCostTextBox1 with the value. not about return statement.

edited Nov 21 '18 at 10:46

S.Akbari

30.3k93673

asked Nov 21 '18 at 9:53

Daniel_Ranjbar

828

2

because of you use return before TotalCostTextBox1.Text = result.ToString(); when you write return current block close

– erdi yılmaz
Nov 21 '18 at 9:56

This should help solve your problem - tutorials.visualstudio.com/vs-get-started/debugging | docs.microsoft.com/en-us/visualstudio/debugger/…

– Rand Random
Nov 21 '18 at 10:06

Change int to void and remove return after look at your designer.cs is it have code like this code this.Load += new System.EventHandler(this.ConfirmForm_Load); code is not add this code

– erdi yılmaz
Nov 21 '18 at 10:31

1

@erdiyılmaz Thankyou your comment poped something in my head which was related to your comment I fixed it and now my problem is solved. thank you :)

– Daniel_Ranjbar
Nov 21 '18 at 10:49

add a comment |

this is my table:

CREATE TABLE [dbo].[InvoiceTable] (

    [Id]                 INT           IDENTITY (1, 1) NOT NULL,

    [CodeColumn]         NVARCHAR (50) NOT NULL,

    [NameColumn]         NVARCHAR (50) NOT NULL,

    [QTYColumn]          INT           NULL,

    [TotalQTYColumn]     INT           NULL,

    [UnitCostColumn]     INT           NOT NULL,

    [DiscountRateColumn] FLOAT (53)    DEFAULT ((0)) NULL,

    [RowTotalColumn]     AS            (([QTYColumn]*[UnitCostColumn])*((1)-[DiscountRateColumn])) PERSISTED,

    PRIMARY KEY CLUSTERED ([Id] ASC)

);

private int ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();

    return int.Parse(result.ToString());

    TotalCostTextBox1.Text = result.ToString();

when I put TotalCostTextBox1.Text = result.ToString(); after return it yells

Unreachable code detected

when I put it before return, TotalCostTextBox1 shows nothing...

Please tell me how to fill the TotalCostTextBox1 with the value. not about return statement.

edited Nov 21 '18 at 10:46

S.Akbari

30.3k93673

asked Nov 21 '18 at 9:53

Daniel_Ranjbar

828

2

because of you use return before TotalCostTextBox1.Text = result.ToString(); when you write return current block close

– erdi yılmaz
Nov 21 '18 at 9:56

This should help solve your problem - tutorials.visualstudio.com/vs-get-started/debugging | docs.microsoft.com/en-us/visualstudio/debugger/…

– Rand Random
Nov 21 '18 at 10:06

Change int to void and remove return after look at your designer.cs is it have code like this code this.Load += new System.EventHandler(this.ConfirmForm_Load); code is not add this code

– erdi yılmaz
Nov 21 '18 at 10:31

1

@erdiyılmaz Thankyou your comment poped something in my head which was related to your comment I fixed it and now my problem is solved. thank you :)

– Daniel_Ranjbar
Nov 21 '18 at 10:49

add a comment |

this is my table:

CREATE TABLE [dbo].[InvoiceTable] (

    [Id]                 INT           IDENTITY (1, 1) NOT NULL,

    [CodeColumn]         NVARCHAR (50) NOT NULL,

    [NameColumn]         NVARCHAR (50) NOT NULL,

    [QTYColumn]          INT           NULL,

    [TotalQTYColumn]     INT           NULL,

    [UnitCostColumn]     INT           NOT NULL,

    [DiscountRateColumn] FLOAT (53)    DEFAULT ((0)) NULL,

    [RowTotalColumn]     AS            (([QTYColumn]*[UnitCostColumn])*((1)-[DiscountRateColumn])) PERSISTED,

    PRIMARY KEY CLUSTERED ([Id] ASC)

);

private int ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();

    return int.Parse(result.ToString());

    TotalCostTextBox1.Text = result.ToString();

when I put TotalCostTextBox1.Text = result.ToString(); after return it yells

Unreachable code detected

when I put it before return, TotalCostTextBox1 shows nothing...

Please tell me how to fill the TotalCostTextBox1 with the value. not about return statement.

edited Nov 21 '18 at 10:46

S.Akbari

30.3k93673

asked Nov 21 '18 at 9:53

Daniel_Ranjbar

828

this is my table:

CREATE TABLE [dbo].[InvoiceTable] (

    [Id]                 INT           IDENTITY (1, 1) NOT NULL,

    [CodeColumn]         NVARCHAR (50) NOT NULL,

    [NameColumn]         NVARCHAR (50) NOT NULL,

    [QTYColumn]          INT           NULL,

    [TotalQTYColumn]     INT           NULL,

    [UnitCostColumn]     INT           NOT NULL,

    [DiscountRateColumn] FLOAT (53)    DEFAULT ((0)) NULL,

    [RowTotalColumn]     AS            (([QTYColumn]*[UnitCostColumn])*((1)-[DiscountRateColumn])) PERSISTED,

    PRIMARY KEY CLUSTERED ([Id] ASC)

);

private int ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();

    return int.Parse(result.ToString());

    TotalCostTextBox1.Text = result.ToString();

when I put TotalCostTextBox1.Text = result.ToString(); after return it yells

Unreachable code detected

when I put it before return, TotalCostTextBox1 shows nothing...

Please tell me how to fill the TotalCostTextBox1 with the value. not about return statement.

c# sql-server ado.net return executescalar

edited Nov 21 '18 at 10:46

S.Akbari

30.3k93673

asked Nov 21 '18 at 9:53

Daniel_Ranjbar

828

edited Nov 21 '18 at 10:46

S.Akbari

30.3k93673

asked Nov 21 '18 at 9:53

Daniel_Ranjbar

828

edited Nov 21 '18 at 10:46

S.Akbari

30.3k93673

edited Nov 21 '18 at 10:46

S.Akbari

30.3k93673

edited Nov 21 '18 at 10:46

S.Akbari

30.3k93673

asked Nov 21 '18 at 9:53

Daniel_Ranjbar

828

asked Nov 21 '18 at 9:53

Daniel_Ranjbar

828

asked Nov 21 '18 at 9:53

Daniel_Ranjbar

828

2

because of you use return before TotalCostTextBox1.Text = result.ToString(); when you write return current block close

– erdi yılmaz
Nov 21 '18 at 9:56

This should help solve your problem - tutorials.visualstudio.com/vs-get-started/debugging | docs.microsoft.com/en-us/visualstudio/debugger/…

– Rand Random
Nov 21 '18 at 10:06

Change int to void and remove return after look at your designer.cs is it have code like this code this.Load += new System.EventHandler(this.ConfirmForm_Load); code is not add this code

– erdi yılmaz
Nov 21 '18 at 10:31

1

@erdiyılmaz Thankyou your comment poped something in my head which was related to your comment I fixed it and now my problem is solved. thank you :)

– Daniel_Ranjbar
Nov 21 '18 at 10:49

add a comment |

2

because of you use return before TotalCostTextBox1.Text = result.ToString(); when you write return current block close

– erdi yılmaz
Nov 21 '18 at 9:56

This should help solve your problem - tutorials.visualstudio.com/vs-get-started/debugging | docs.microsoft.com/en-us/visualstudio/debugger/…

– Rand Random
Nov 21 '18 at 10:06

Change int to void and remove return after look at your designer.cs is it have code like this code this.Load += new System.EventHandler(this.ConfirmForm_Load); code is not add this code

– erdi yılmaz
Nov 21 '18 at 10:31

1

@erdiyılmaz Thankyou your comment poped something in my head which was related to your comment I fixed it and now my problem is solved. thank you :)

– Daniel_Ranjbar
Nov 21 '18 at 10:49

because of you use return before TotalCostTextBox1.Text = result.ToString(); when you write return current block close

– erdi yılmaz
Nov 21 '18 at 9:56

This should help solve your problem - tutorials.visualstudio.com/vs-get-started/debugging | docs.microsoft.com/en-us/visualstudio/debugger/…

– Rand Random
Nov 21 '18 at 10:06

Change int to void and remove return after look at your designer.cs is it have code like this code this.Load += new System.EventHandler(this.ConfirmForm_Load); code is not add this code

– erdi yılmaz
Nov 21 '18 at 10:31

@erdiyılmaz Thankyou your comment poped something in my head which was related to your comment I fixed it and now my problem is solved. thank you :)

– Daniel_Ranjbar
Nov 21 '18 at 10:49

add a comment |

3 Answers
3

active

oldest

votes

You need to place below assignment statement before return

TotalCostTextBox1.Text = result.ToString();

Your final code should be like below code:

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();

    TotalCostTextBox1.Text = result.ToString();

    //return int.Parse(result.ToString());

}

Also you need to check the event binding with ConfirmForm_Load function. To verify this please check if following line is available in ConfirmForm.Designer.cs

this.Load += new System.EventHandler(this.ConfirmForm_Load);

answered Nov 21 '18 at 10:55

Brijesh Kumar Tripathi

14519

add a comment |

The return type of your method is int, this is why you are getting error. You can change your method return type to void and remove the return keyword:

private void ConfirmForm_Load

And

var result = sqlcmd.ExecuteScalar();

int x = int.Parse(result.ToString());

TotalCostTextBox1.Text = x.ToString();

edited Nov 21 '18 at 16:24

answered Nov 21 '18 at 9:55

S.Akbari

30.3k93673

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works. thank you...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

Unreachable code detected

Well that's cause you are assigning to your Textbox after the return statement which will never reach. it's a event handler and thus should of void type since event handler doesn't return anything.

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();                

    this.TotalCostTextBox1.Text = result.ToString();

Considering TotalCostTextBox1 is the instance name of the TotalCostTextBox1 control

edited Nov 28 '18 at 9:12

S.Akbari

30.3k93673

answered Nov 21 '18 at 10:04

Rahul

62.5k124482

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works.Thank you buddy...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

You need to place below assignment statement before return

TotalCostTextBox1.Text = result.ToString();

Your final code should be like below code:

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();

    TotalCostTextBox1.Text = result.ToString();

    //return int.Parse(result.ToString());

}

Also you need to check the event binding with ConfirmForm_Load function. To verify this please check if following line is available in ConfirmForm.Designer.cs

this.Load += new System.EventHandler(this.ConfirmForm_Load);

answered Nov 21 '18 at 10:55

Brijesh Kumar Tripathi

14519

add a comment |

You need to place below assignment statement before return

TotalCostTextBox1.Text = result.ToString();

Your final code should be like below code:

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();

    TotalCostTextBox1.Text = result.ToString();

    //return int.Parse(result.ToString());

}

Also you need to check the event binding with ConfirmForm_Load function. To verify this please check if following line is available in ConfirmForm.Designer.cs

this.Load += new System.EventHandler(this.ConfirmForm_Load);

answered Nov 21 '18 at 10:55

Brijesh Kumar Tripathi

14519

add a comment |

You need to place below assignment statement before return

TotalCostTextBox1.Text = result.ToString();

Your final code should be like below code:

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();

    TotalCostTextBox1.Text = result.ToString();

    //return int.Parse(result.ToString());

}

Also you need to check the event binding with ConfirmForm_Load function. To verify this please check if following line is available in ConfirmForm.Designer.cs

this.Load += new System.EventHandler(this.ConfirmForm_Load);

answered Nov 21 '18 at 10:55

Brijesh Kumar Tripathi

14519

You need to place below assignment statement before return

TotalCostTextBox1.Text = result.ToString();

Your final code should be like below code:

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();

    TotalCostTextBox1.Text = result.ToString();

    //return int.Parse(result.ToString());

}

Also you need to check the event binding with ConfirmForm_Load function. To verify this please check if following line is available in ConfirmForm.Designer.cs

this.Load += new System.EventHandler(this.ConfirmForm_Load);

answered Nov 21 '18 at 10:55

Brijesh Kumar Tripathi

14519

answered Nov 21 '18 at 10:55

Brijesh Kumar Tripathi

14519

answered Nov 21 '18 at 10:55

Brijesh Kumar Tripathi

14519

answered Nov 21 '18 at 10:55

Brijesh Kumar Tripathi

14519

add a comment |

The return type of your method is int, this is why you are getting error. You can change your method return type to void and remove the return keyword:

private void ConfirmForm_Load

And

var result = sqlcmd.ExecuteScalar();

int x = int.Parse(result.ToString());

TotalCostTextBox1.Text = x.ToString();

edited Nov 21 '18 at 16:24

answered Nov 21 '18 at 9:55

S.Akbari

30.3k93673

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works. thank you...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

The return type of your method is int, this is why you are getting error. You can change your method return type to void and remove the return keyword:

private void ConfirmForm_Load

And

var result = sqlcmd.ExecuteScalar();

int x = int.Parse(result.ToString());

TotalCostTextBox1.Text = x.ToString();

edited Nov 21 '18 at 16:24

answered Nov 21 '18 at 9:55

S.Akbari

30.3k93673

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works. thank you...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

The return type of your method is int, this is why you are getting error. You can change your method return type to void and remove the return keyword:

private void ConfirmForm_Load

And

var result = sqlcmd.ExecuteScalar();

int x = int.Parse(result.ToString());

TotalCostTextBox1.Text = x.ToString();

edited Nov 21 '18 at 16:24

answered Nov 21 '18 at 9:55

S.Akbari

30.3k93673

The return type of your method is int, this is why you are getting error. You can change your method return type to void and remove the return keyword:

private void ConfirmForm_Load

And

var result = sqlcmd.ExecuteScalar();

int x = int.Parse(result.ToString());

TotalCostTextBox1.Text = x.ToString();

edited Nov 21 '18 at 16:24

answered Nov 21 '18 at 9:55

S.Akbari

30.3k93673

edited Nov 21 '18 at 16:24

answered Nov 21 '18 at 9:55

S.Akbari

30.3k93673

answered Nov 21 '18 at 9:55

S.Akbari

30.3k93673

answered Nov 21 '18 at 9:55

S.Akbari

30.3k93673

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works. thank you...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works. thank you...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works. thank you...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

Unreachable code detected

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();                

    this.TotalCostTextBox1.Text = result.ToString();

Considering TotalCostTextBox1 is the instance name of the TotalCostTextBox1 control

edited Nov 28 '18 at 9:12

S.Akbari

30.3k93673

answered Nov 21 '18 at 10:04

Rahul

62.5k124482

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works.Thank you buddy...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

Unreachable code detected

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();                

    this.TotalCostTextBox1.Text = result.ToString();

Considering TotalCostTextBox1 is the instance name of the TotalCostTextBox1 control

edited Nov 28 '18 at 9:12

S.Akbari

30.3k93673

answered Nov 21 '18 at 10:04

Rahul

62.5k124482

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works.Thank you buddy...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

Unreachable code detected

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();                

    this.TotalCostTextBox1.Text = result.ToString();

Considering TotalCostTextBox1 is the instance name of the TotalCostTextBox1 control

edited Nov 28 '18 at 9:12

S.Akbari

30.3k93673

answered Nov 21 '18 at 10:04

Rahul

62.5k124482

Unreachable code detected

private void ConfirmForm_Load(object sender, EventArgs e)

{

    string selectQuery = "SELECT Sum(RowTotalColumn) FROM InvoiceTable";

    var sqlcmd = new SqlCommand(selectQuery, sqlcon);

    var result = sqlcmd.ExecuteScalar();                

    this.TotalCostTextBox1.Text = result.ToString();

Considering TotalCostTextBox1 is the instance name of the TotalCostTextBox1 control

edited Nov 28 '18 at 9:12

S.Akbari

30.3k93673

answered Nov 21 '18 at 10:04

Rahul

62.5k124482

edited Nov 28 '18 at 9:12

S.Akbari

30.3k93673

edited Nov 28 '18 at 9:12

S.Akbari

30.3k93673

edited Nov 28 '18 at 9:12

S.Akbari

30.3k93673

answered Nov 21 '18 at 10:04

Rahul

62.5k124482

answered Nov 21 '18 at 10:04

Rahul

62.5k124482

answered Nov 21 '18 at 10:04

Rahul

62.5k124482

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works.Thank you buddy...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works.Thank you buddy...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

Ok I got it its okay I had manipulated something unintentionally in the designer.cs now it works.Thank you buddy...

– Daniel_Ranjbar
Nov 21 '18 at 10:47

add a comment |

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