How to fix "index out of range" error when user submits no data in form?

[Toshi Trivedi]

Hi,

I am receiving an error if user is not selecting any row in data grid and clicking on the Apply button. The message is
Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

I want to put a check for it but unable to do it.

Thanks in advance

[Stewart Ross]

Please post the event code from your Apply button.

-S

[Jason Mortmer]

if you are getting the index of a list control, the selected index will be '-1' if nothing is selected. That way you can check if anything was selected because selections start at 0.

[Toshi Trivedi]

Thanks, sending you code for Apply button

 void btnApply_Click(object sender, EventArgs e)
        {
            try
            {
                if (SelectedID == null)
                {
                    MessageBox.Show("Select a row from grid");
                    dgriduser.Focus();
 
                }
 
                depinfo = new deptdata();
                depinfo.dept_no = dgriduser.SelectedRows[0].Cells[0].Value.ToString();
 
                depinfo.dept_name = dgriduser.SelectedRows[0].Cells[1].Value.ToString();
 
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
            catch (Exception ex)
            {
 
                MessageBox.Show(ex.Message);
            }
        } // End of btnApply_Click Event

[Stewart Ross]

Have you tried Jason's suggestion about the index for the list control?

-S

[Toshi Trivedi]

I am using this code but still i am getting the same message.
if (cmbsearch.SelectedIndex < 0)
{
MessageBox.Show("Select a row from grid");
dgriduser.Focus();
}
The control is shifting back to combo box but the exception is generating
Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

Please guide me.