Hello everyone!

I have a control that derives from WebControls.Table. This control has a
method CreateTable() that builds a simple table. I also have second
control that, again, derives from Table. This control instantiates an
instance of the first control and then i want to copy all the rows of this
control  into this.Rows like this:

TableControl1 tc1 = new TableControl1(); tc1.CreateTable(); foreach
(TableRow tr in tc1.Rows)
    this.Rows.Add(tr);

And what i get is a exception:

The list that this enumerator is bound to has been modified. An enumerator
can only be used if the list doesn't change.

i don't quite understand what happens here. Apparently Rows.Add somehow
changes the original RowCollection...

Could anyone tell me what happens and why?

Also, what is the recommended way to copy all rows from one table into
another table. Ideally i don't want a copy of the original rows to be
made, I just want to put the references to the orignial rows into the
second table's Row collection.

I added a complete sample that shows this behaviour below.
Thanks a lot  :o)

Ben

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace tester
{

    [ToolboxData("<{0}:TableControl1 runat=server></{0}:TableControl1>")]

    public class TableControl1 : System.Web.UI.WebControls.Table    {
        protected override void CreateChildControls() {
            CreateTable();
        }
        public void CreateTable() {
            TableRow tr = new TableRow();
            TableCell td = new TableCell();
            td.Text = "test";
            tr.Cells.Add(td);
            this.Rows.Add(tr);
            TableRow tr2 = new TableRow();
            TableCell td2 = new TableCell();
            td2.Text = "test2";
            tr2.Cells.Add(td2);
            this.Rows.Add(tr2);
            TableRow tr3 = new TableRow();
            TableCell td3 = new TableCell();
            td3.Text = "test3";
            tr3.Cells.Add(td3);
            this.Rows.Add(tr3);
        }
    }
    public class TableControl2 : System.Web.UI.WebControls.Table {
        protected override void CreateChildControls() {
            TableControl1 tc1 = new TableControl1();
            tc1.CreateTable();
            foreach(TableRow tr in tc1.Rows)
                this.Rows.Add(tr);
        }
    }
}