How to add panel into another panel [duplicate]

-2

This question already has an answer here:

What is a NullReferenceException, and how do I fix it?

31 answers

I want to add one of panel1,2,... into panel0 when I click on button1 .

enter image description here

It's my code

private void button3_Click(object sender, EventArgs e)

        {

            int i = 0;

            int j = 0;





            Panel pnl = new Panel[3];



            while ( i<2)

            {

                pnl[i].Parent = panel0;                  // erorr



                pnl[i].BackColor = Color.PeachPuff;



                pnl[i].Size = new Size(50, 10);

                pnl[i].Location = new Point(j+5,10);

                panel0.Controls.Add(pnl[i]);

                pnl[i].BringToFront();



                i++;

                j = j + 13;

            }

         }

enter image description here

Have a suggestion ?

edited Jan 2 at 12:23

slugster

42.3k1282127

asked Jan 2 at 12:02

jsmlz

marked as duplicate by Liam, slugster c#
Users with the c# badge can single-handedly close c# questions as duplicates and reopen them as needed.

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Jan 2 at 12:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Could you let us know what's the error you got?

– Imantas
Jan 2 at 12:04

2

well, your panel hasn't initialized yet, you only call the array constructor, but you should still use pnl[i] = new Panel() before you can access its members. For the rest, you should choose between having it as parent, or assigning it to the controls of panel0, as both do pretty much the same

– Icepickle
Jan 2 at 12:06

1

what technology is this? Winforms, WPF, webforms, Xamarin?

– Liam
Jan 2 at 12:07

It's windows form

– jsmlz
Jan 2 at 12:13

add a comment |

-2

This question already has an answer here:

What is a NullReferenceException, and how do I fix it?

31 answers

I want to add one of panel1,2,... into panel0 when I click on button1 .

enter image description here

It's my code

private void button3_Click(object sender, EventArgs e)

        {

            int i = 0;

            int j = 0;





            Panel pnl = new Panel[3];



            while ( i<2)

            {

                pnl[i].Parent = panel0;                  // erorr



                pnl[i].BackColor = Color.PeachPuff;



                pnl[i].Size = new Size(50, 10);

                pnl[i].Location = new Point(j+5,10);

                panel0.Controls.Add(pnl[i]);

                pnl[i].BringToFront();



                i++;

                j = j + 13;

            }

         }

enter image description here

Have a suggestion ?

edited Jan 2 at 12:23

slugster

42.3k1282127

asked Jan 2 at 12:02

jsmlz

marked as duplicate by Liam, slugster c#
Users with the c# badge can single-handedly close c# questions as duplicates and reopen them as needed.

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Jan 2 at 12:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Could you let us know what's the error you got?

– Imantas
Jan 2 at 12:04

2

well, your panel hasn't initialized yet, you only call the array constructor, but you should still use pnl[i] = new Panel() before you can access its members. For the rest, you should choose between having it as parent, or assigning it to the controls of panel0, as both do pretty much the same

– Icepickle
Jan 2 at 12:06

1

what technology is this? Winforms, WPF, webforms, Xamarin?

– Liam
Jan 2 at 12:07

It's windows form

– jsmlz
Jan 2 at 12:13

add a comment |

-2

This question already has an answer here:

What is a NullReferenceException, and how do I fix it?

31 answers

I want to add one of panel1,2,... into panel0 when I click on button1 .

enter image description here

It's my code

private void button3_Click(object sender, EventArgs e)

        {

            int i = 0;

            int j = 0;





            Panel pnl = new Panel[3];



            while ( i<2)

            {

                pnl[i].Parent = panel0;                  // erorr



                pnl[i].BackColor = Color.PeachPuff;



                pnl[i].Size = new Size(50, 10);

                pnl[i].Location = new Point(j+5,10);

                panel0.Controls.Add(pnl[i]);

                pnl[i].BringToFront();



                i++;

                j = j + 13;

            }

         }

enter image description here

Have a suggestion ?

edited Jan 2 at 12:23

slugster

42.3k1282127

asked Jan 2 at 12:02

jsmlz

This question already has an answer here:

What is a NullReferenceException, and how do I fix it?

31 answers

I want to add one of panel1,2,... into panel0 when I click on button1 .

enter image description here

It's my code

private void button3_Click(object sender, EventArgs e)

        {

            int i = 0;

            int j = 0;





            Panel pnl = new Panel[3];



            while ( i<2)

            {

                pnl[i].Parent = panel0;                  // erorr



                pnl[i].BackColor = Color.PeachPuff;



                pnl[i].Size = new Size(50, 10);

                pnl[i].Location = new Point(j+5,10);

                panel0.Controls.Add(pnl[i]);

                pnl[i].BringToFront();



                i++;

                j = j + 13;

            }

         }

enter image description here

Have a suggestion ?

This question already has an answer here:

What is a NullReferenceException, and how do I fix it?

31 answers

c# forms panel

edited Jan 2 at 12:23

slugster

42.3k1282127

asked Jan 2 at 12:02

jsmlz

edited Jan 2 at 12:23

slugster

42.3k1282127

asked Jan 2 at 12:02

jsmlz

edited Jan 2 at 12:23

slugster

42.3k1282127

edited Jan 2 at 12:23

slugster

42.3k1282127

edited Jan 2 at 12:23

slugster

42.3k1282127

asked Jan 2 at 12:02

jsmlz

asked Jan 2 at 12:02

jsmlz

asked Jan 2 at 12:02

jsmlz

marked as duplicate by Liam, slugster c#
Users with the c# badge can single-handedly close c# questions as duplicates and reopen them as needed.

StackExchange.ready(function() {
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Jan 2 at 12:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

marked as duplicate by Liam, slugster c#
Users with the c# badge can single-handedly close c# questions as duplicates and reopen them as needed.

StackExchange.ready(function() {
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$hover.showInfoMessage('', {
messageElement: $msg.clone().show(),
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dismissable: false,
relativeToBody: true
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StackExchange.helpers.removeMessages();
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Jan 2 at 12:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Could you let us know what's the error you got?

– Imantas
Jan 2 at 12:04

2

well, your panel hasn't initialized yet, you only call the array constructor, but you should still use pnl[i] = new Panel() before you can access its members. For the rest, you should choose between having it as parent, or assigning it to the controls of panel0, as both do pretty much the same

– Icepickle
Jan 2 at 12:06

1

what technology is this? Winforms, WPF, webforms, Xamarin?

– Liam
Jan 2 at 12:07

It's windows form

– jsmlz
Jan 2 at 12:13

add a comment |

Could you let us know what's the error you got?

– Imantas
Jan 2 at 12:04

2

well, your panel hasn't initialized yet, you only call the array constructor, but you should still use pnl[i] = new Panel() before you can access its members. For the rest, you should choose between having it as parent, or assigning it to the controls of panel0, as both do pretty much the same

– Icepickle
Jan 2 at 12:06

1

what technology is this? Winforms, WPF, webforms, Xamarin?

– Liam
Jan 2 at 12:07

It's windows form

– jsmlz
Jan 2 at 12:13

Could you let us know what's the error you got?

– Imantas
Jan 2 at 12:04

well, your panel hasn't initialized yet, you only call the array constructor, but you should still use pnl[i] = new Panel() before you can access its members. For the rest, you should choose between having it as parent, or assigning it to the controls of panel0, as both do pretty much the same

– Icepickle
Jan 2 at 12:06

what technology is this? Winforms, WPF, webforms, Xamarin?

– Liam
Jan 2 at 12:07

It's windows form

– jsmlz
Jan 2 at 12:13

add a comment |

1 Answer
1

active

oldest

votes

change Panel pnl = new Panel[3] to:

var pnl  = new List<Panel>{existingPanel1, existingPanel2, existingPanel3};

answered Jan 2 at 12:20

CodeMan

557311

existingPanel1,2,3 are in your form.

– CodeMan
Jan 2 at 12:21

thank you , How can I do this if the number of panels is too high?

– jsmlz
Jan 2 at 12:30

foreach (Control control in Controls) if (control is Panel) // and other conditions to add to pnl list

– CodeMan
Jan 2 at 12:37

Thanks my Friend

– jsmlz
Jan 2 at 12:40

add a comment |

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

change Panel pnl = new Panel[3] to:

var pnl  = new List<Panel>{existingPanel1, existingPanel2, existingPanel3};

answered Jan 2 at 12:20

CodeMan

557311

existingPanel1,2,3 are in your form.

– CodeMan
Jan 2 at 12:21

thank you , How can I do this if the number of panels is too high?

– jsmlz
Jan 2 at 12:30

foreach (Control control in Controls) if (control is Panel) // and other conditions to add to pnl list

– CodeMan
Jan 2 at 12:37

Thanks my Friend

– jsmlz
Jan 2 at 12:40

add a comment |

change Panel pnl = new Panel[3] to:

var pnl  = new List<Panel>{existingPanel1, existingPanel2, existingPanel3};

answered Jan 2 at 12:20

CodeMan

557311

existingPanel1,2,3 are in your form.

– CodeMan
Jan 2 at 12:21

thank you , How can I do this if the number of panels is too high?

– jsmlz
Jan 2 at 12:30

foreach (Control control in Controls) if (control is Panel) // and other conditions to add to pnl list

– CodeMan
Jan 2 at 12:37

Thanks my Friend

– jsmlz
Jan 2 at 12:40

add a comment |

change Panel pnl = new Panel[3] to:

var pnl  = new List<Panel>{existingPanel1, existingPanel2, existingPanel3};

answered Jan 2 at 12:20

CodeMan

557311

change Panel pnl = new Panel[3] to:

var pnl  = new List<Panel>{existingPanel1, existingPanel2, existingPanel3};

answered Jan 2 at 12:20

CodeMan

557311

answered Jan 2 at 12:20

CodeMan

557311

answered Jan 2 at 12:20

CodeMan

557311

answered Jan 2 at 12:20

CodeMan

557311

existingPanel1,2,3 are in your form.

– CodeMan
Jan 2 at 12:21

thank you , How can I do this if the number of panels is too high?

– jsmlz
Jan 2 at 12:30

foreach (Control control in Controls) if (control is Panel) // and other conditions to add to pnl list

– CodeMan
Jan 2 at 12:37

Thanks my Friend

– jsmlz
Jan 2 at 12:40

add a comment |

existingPanel1,2,3 are in your form.

– CodeMan
Jan 2 at 12:21

thank you , How can I do this if the number of panels is too high?

– jsmlz
Jan 2 at 12:30

foreach (Control control in Controls) if (control is Panel) // and other conditions to add to pnl list

– CodeMan
Jan 2 at 12:37

Thanks my Friend

– jsmlz
Jan 2 at 12:40

existingPanel1,2,3 are in your form.

– CodeMan
Jan 2 at 12:21

thank you , How can I do this if the number of panels is too high?

– jsmlz
Jan 2 at 12:30

foreach (Control control in Controls) if (control is Panel) // and other conditions to add to pnl list

– CodeMan
Jan 2 at 12:37

Thanks my Friend

– jsmlz
Jan 2 at 12:40

add a comment |

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