C#, Winform Error while trying to Show Data to Textbox from Datagridview

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Hello, Here's the scenario:

I have to Forms , Form 1 and Form 2:

In Form 1, is where the DatagridView, in Form 2, all the textbox are set Modifiers to "Internal" so that i can show datas from datagrid.

What i am doing is I am showing datagridview to textbox to Form 2;

C#

LeaseShowDataFields lsdf = new LeaseShowDataFields();

            lsdf.metropropertycodetxtBox.Text = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();

            lsdf.Show();

It works correctly it shows to Form2, but after closing the Form 2 it throws error:

C#

Collection was modified; enumeration operation may not execute.

How to handle this Exception? Kindly Help

Posted 29-Jan-16 21:49pm

Rencyrence

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Sascha Lefèvre · Answer 1 · 2016-01-30T00:27:00

You can't modify a collection while enumerating it, e.g. this would produce the same error:

C#

List<int> items = new List<int>() { 1, 2, 3 };
foreach(int item in items)
{
    items.Add(item+1);
}

You probably modify a collection from Form2 over which you are enumerating in Form1. Maybe the selected DataGrid-Rows? Maybe the DataGrid-Rows in general?

You can either make a copy of the collection you need to enumerate beforehand in order to modify the original collection while enumerating the copied one. Or you don't immediately modify the collection but create some kind of "actions to be taken on the collection"-list for when the enumeration is finished.