How to add buttons dynamically to my form

Question

I want to create 10 buttons on my form when I click on button1  No error with this code below but it doesnt work either   private void button1 Click object sender  EventArgs e        List lt Button gt  buttons   new List lt Button gt         for  int i   0  i  lt  buttons Capacity  i                  this Controls Add buttons i

User · Answer

I had the same doubt and came up with the following contribution:

 int height = this.Size.Height;
 int width = this.Size.Width;

 int widthOffset = 10;
 int heightOffset = 10;

 int btnWidth = 100;  // Button Widht
 int btnHeight = 40;  // Button Height

 for (int i = 0; i < 50; ++i)
 {
     if ((widthOffset + btnWidth) >= width)
     {                    
         widthOffset = 10;
         heightOffset = heightOffset + btnHeight

         var button = new Button();
         button.Size = new Size(btnWidth, btnHeight);
         button.Name = "" + i + "";
         button.Text = "" + i + "";
         //button.Click += button_Click; // Button Click Event
         button.Location = new Point(widthOffset, heightOffset);

         Controls.Add(button);

         widthOffset = widthOffset + (btnWidth);
     }

     else
     {                        
         var button = new Button();
         button.Size = new Size(btnWidth, btnHeight);
         button.Name = "" + i + "";
         button.Text = "" + i + "";
         //button.Click += button_Click; // Button Click Event
         button.Location = new Point(widthOffset, heightOffset);

         Controls.Add(button);

         widthOffset = widthOffset + (btnWidth);
      }
  }

Expected Behaviour:
This will generate the buttons dinamically and using the current window size, "break a line" when the button exceeds the right margin of your window.

User · Answer

You aren t creating any buttons  you just have an empty list   You can forget the list and just create the buttons in the loop   private void button1 Click object sender  EventArgs e               int top   50       int left   100        for  int i   0  i  lt  10  i                                   Button button   new Button                 button Left   left            button Top   top            this Controls Add button                   top    button Height   2

User · Answer

You could do something like this   Point newLoc   new Point 5 5      Set whatever you want for initial location for int i 0  i  lt  10    i        Button b   new Button        b Size   new Size 10  50       b Location   newLoc      newLoc Offset 0  b Height   5       Controls Add b       If you want them to layout in any sort of reasonable fashion it would be better to add them to one of the layout panels  i e  FlowLayoutPanel  or to align them yourself

User · Answer

use button array like this it will create 3 dynamic buttons bcoz h variable has value of 3  private void button1 Click object sender  EventArgs e    int h  3    Button   buttonArray   new Button 8    for  int i   0  i  lt   h-1  i         buttonArray i    new Button       buttonArray i  Size   new Size 20  43      buttonArray i  Name     i        buttonArray i  Click    button Click   function    buttonArray i  Location   new Point 40  20    i   20        panel1 Controls Add buttonArray i

User · Answer

You can t add a Button to an empty list without creating a new instance of that Button   You are missing the   Button newButton   new Button        in your code plus get rid of the  Capacity

User · Answer

Two problems- List is empty  You need to add some buttons to the list first  Second problem  You can t add buttons to  this    This  is not referencing what you think  I think  Change this to reference a Panel for instance     Assume you have on your  aspx page   lt asp Panel ID  Panel Controls  runat  server  gt  lt  asp Panel gt    private void button1 Click object sender  EventArgs e                List lt Button gt  buttons   new List lt Button gt               for  int i   0  i  lt  buttons Capacity  i                          Panel Controls Controls Add buttons i

User · Answer

It doesn t work because the list is empty  Try this   private void button1 Click object sender  EventArgs e        List lt Button gt  buttons   new List lt Button gt         for  int i   0  i  lt  10  i                  Button newButton   new Button            buttons Add newButton           this Controls Add newButton

User · Answer

First  you aren t actually creating 10 buttons  Second  you need to set the location of each button  or they will appear on top of each other  This will do the trick     for  int i   0  i  lt  10    i            var button   new Button          button Location   new Point button Width   i   4  0         Controls Add button

[c#] How to add buttons dynamically to my form?

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