c# dynamic checkboxes creating

Question

I am trying to create dynamic checkboxes in a for loop. But I am getting error not during compiling but when I run create checkbox button and run that function. Can you please tell me what I am doing wrong?

 public void CreateCheckBox (int i)
         {
              int y = 10;
              CheckBox[] _cb = new CheckBox[i];
              String chkBox = "chkBox_";
              for (int n = 0; n<i; n++)
                    {
                       _cb[n].Location = new Point(10, y);
                       _cb[n].Name= chkBox + n.ToString();
                       form1.Controls.Add(_cb[n]);
                       y+= 15;
                    }
         }

Bala R · Accepted Answer · 2011-10-05 14:13:27Z

6

Inside the loop, you'll have to create a new instance of checkbox.

for (int n = 0; n<i; n++)
{
   _cb[n] = new CheckBox();
   _cb[n].Location = new Point(10, y);
   _cb[n].Name= chkBox + n.ToString();
   form1.Controls.Add(_cb[n]);
   y+= 15;
}

answered Oct 5, 2011 at 14:13

Bala R

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2 Comments

Val Nolav Over a year ago

Bala what if I want to delete on of these checkboxes? how can I create a form1.Controls.Remove() thing?

Bala R Over a year ago

@ValNolav to remove, you can do Control cb = form1.FindControl(controlName); form1.Controls.Remove(cb);

Daniel Peñalba · Accepted Answer · 2011-10-05 14:21:15Z

0

When you define an Array of Checkboxes, the objects inside the array are initialized to null. You need to create an instance of the Checkbox using new Checkbox().

In my opinion, you don't need to save them into a Checkbox[] since the Form manages a control collection. So, this code snippet is maybe more readable:

public void CreateCheckBox (int max)
{
    String name = "chkBox_";
    int y = 10;
    for (int i = 0; n < max; i++)
    {
        Checkbox current = new Checkbox();
        current.Location = new Point(10, y);
        current.Name= name + i.ToString();
        form1.Controls.Add(current);
        y+= 15;
    }
}

answered Oct 5, 2011 at 14:21

Daniel Peñalba

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2 Comments

Val Nolav Over a year ago

I need to delete textboxes in a row by clicking checkbox in the same row. How can I do that by clicking a button??

Daniel Peñalba Over a year ago

I recommend you to store the row index in the checkbox.Tag, then you listen the CheckedChanged event in the textbox (using += ) and in the Event handler, take the row index from the tag of the sender.

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