ASP.Net + Removing controls from groupbox using ForEach loop

Hi Friends,

Yesterday I was resolving a problem. I was getting that I am removing same control from a group box. I am giving you an example. I add 10 same controls dynamically in the group box. Then on one click on Remove button, I need to remove all these controls from group box. The code was written by me was as follows:

foreach (Control ctl in grp1.Controls)
{
if (ctl.GetType().ToString().EndsWith(".ctl1"))
{
grp1.Controls.Remove(ctl);
}
}

When I debug this code, understand the problem that all the controls are not removing from this group box. Then I change the logic with the following one.

int intNoOfControls = grp1.Controls.Count;
for (int i = intNoOfControls - 1; i >= 0; i--)
{
if (grp1.Controls[i].GetType().ToString().EndsWith(".ctl1"))
{
grp1.Controls.Remove(grp1.Controls[i]);
}
}

This code working perfect and resolve the problem. But do you know what was the problem there in for each loop? Its really very interesting. When I am going to remove control from for each loop its removing and compare with the (group box controls -1) controls (i.e. its reinitialize the controls). So its not removing all the controls from the group box.

Note: If you want to add your comments for this article please add it below. Your suggesion are really great advice for me.

Thanks Buddy,
Vijay Modi