Hi Friends,
i would like your help as i am getting some problems with the following code.
i have marked the lines in red color.
please help me out.

private void btnauthor_Click(object sender, System.EventArgs e)
{
    int i;
    CheckBox cb;
    DataGridItem dgitem;
    for(i=0;dgemp.Items.Count-1;i++)
    {
         dgitem= dgemp.Items[i];
         cb=(CheckBox)(dgitem.FindControl("chk1"));
    }
    if(cb ="" && cb.Checked )
    {
        ordList += dgitem.Cells[1].Text + "";
    }
    lblexec.Text= KillEnding(ordList.Trim());
}

private string KillEnding(string sItem)
{
    return sItem.Substring(0,sItem.Length-1);
}

You are assigning cb="" and checking.That is the problem.Check with == operator instead of =

Thanks...
but i need to know about the first problem also....ie for loop one...

Regards,
muskaan

Hi u didnt mention the condition for it
for(i=0;i > dgemp.Items.Count-1;i++)

Hi,
i am still getting error for...
  if(cb ="" && cb.Checked )
and the error is : operator == cannot be applied to the operands of the type "system.web.ui.webcontrols.checkbox" and "string"

Thanks & Regards,
Muskaan.

cb is an object..Check for null and cb.Checked

Hi,
please let me tell you the details.

I am trying to display checkboxes in the datagrid.

In this program, I have done the coding for “Select All” and “Clear All” buttons but I am getting error for “GetEmployeeIDs” button.



The code is as follows:



private void btnauthor_Click(object sender, System.EventArgs e)

            {

                  int i;

                  CheckBox cb;

                  DataGridItem dgitem;

                  for(i=0;dgemp.Items.Count-1;i++)
                  {

                         dgitem= dgemp.Items[i];

                         cb=(CheckBox)(dgitem.FindControl("chk1"));

                  }

                  if(cb ==null && cb.Checked )
                  {

                        ordList += dgitem.Cells[1].Text + "";

                  }

                  lblexec.Text= KillEnding(ordList.Trim());

            }



            private string KillEnding(string sItem)

            {

                  return sItem.Substring(0,sItem.Length-1);

            }

 now, i am getting runtime error and that is : object reference not set to an instance of the object.

Thanks & Regards,

Muskaan.

You might run into problems with this

if(cb ==null && cb.Checked )
{
...
}

If cb is null, then the if will fail but the second test of the if will crash becuase cb is null.

Try this:

if(cb==null)
{
    if(cb.Checked)
    {
    ...
    }
}

-Peter

Wait, sorry, that makes no sense. Why would you test for cb==null AND see if it's checked??

-Peter

peter,this doesn't crash if cb is null because of compiler optimization,
if(cb ==null || cb.Checked ){}

_____________
Mehdi.
software student.