Question

I currently have a Sharepoint 2010 web part which includes several labels. I want to programmatically remove all but one of these labels.

I tried the code below but got a System.InvalidOperationException because obviously one can’t modify a collection while iterating through it. However, I don’t know how else to try this.

    private void clearLabels()
    {
        foreach (Control cont in this.Controls)
            if (cont is Label && cont.ID != "error")
                this.Controls.Remove(cont);
    }

Answer 1

Iterate over it backwards.

for(int i = this.Controls.Count - 1; i >= 0; i--)
{
    if (this.Controls[i] is Label && this.Controls[i].ID != "error")
    {
        this.Controls.Remove(this.Controls[i]);
    }
}