CODEWITHSUNDEEP
c#checkbox
Val Nolav
Val Nolav

Reputation: 902

c# dynamic checkboxes creating

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;
                    }
         }

Upvotes: 1

Views: 13366

Answers (2)

Daniel Pe&#241;alba
Daniel Pe&#241;alba

Reputation: 31847

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;
    }
}

Upvotes: 0

Bala R
Bala R

Reputation: 108937

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;
}

Upvotes: 6

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