Collection was modified; enumeration operation might not execute exception when adding a radio button to a dynamically created Obout grid?

Question

I tried adding the radio button to the data source as I have no idea how to add the radio button to a dynamic Obout grid and I'm receiving a Collection was modified; enumeration operation might not execute exception. is there a way to add it to the DataTable a different way? or should I try adding the radio button to a list and then adding the list instead of the radio button directly?

public Grid gridTickets = new Grid(); //Obout grid initializing code

Column id = new Column();//Creating the Obout grid columns
id.DataField = "id";
id.HeaderText = "Ticket Nr";
id.Width = globals.SecurityKey == 5 ? "10%" : "8%";

Column severity = new Column();
severity.DataField = "severity";
severity.HeaderText = "Severity";
severity.Width = "10%";

gridTickets.Columns.Add(id);//Adding the columns to the Obout grid
gridTickets.Columns.Add(severity);

placeHere.Controls.Add(gridTickets);//Add the OboutGrid to the Place holder on the aspx side

dt = helpers.DisplayTickets();
RadioButton rb = new RadioButton();
int i = 1;
foreach (DataRow r in dt.Rows)
{
    string temp = r[1].ToString();
    if (r[].ToString().Contains("Level"))
    {
        rb.ID = "rb" + i;
        dt.Rows.Add(r[1].ToString() + rb);
    }
    i++;
}

gridTickets.DataSource = dt;//Adding the DataTable to the Obout grid DataSource
gridTickets.DataBind();

Answer 1

Hi guys thank you all for the awesome responses they helped me a lot I ended up using a Font awesome icon and adding that as a Lable in DataBound method. And even made it only show when an entry's resolution date has already expired.

This Is the building of the grid

public Grid gridTickets = new Grid(); //Obout grid initializing code

Column id = new Column();//Creating the Obout grid columns
id.DataField = "id";
id.HeaderText = "Ticket Nr";
id.Width = globals.SecurityKey == 5 ? "10%" : "8%";

Column severity = new Column();
severity.DataField = "severity";
severity.HeaderText = "Severity";
severity.Width = "10%";


gridTickets.ID = "gridTickets";//Grid settings
gridTickets.RowDataBound += new GridRowEventHandler(OnGridDataBound);// adding a DataBound method

gridTickets.Columns.Add(id);//Adding the columns to the Obout grid
gridTickets.Columns.Add(severity);

placeHere.Controls.Add(gridTickets);//Add the OboutGrid to the Place holder on the aspx side

DataTable dt = helpers.DisplayTickets();


gridTickets.DataSource = dt;//Adding the DataTable to the Obout grid DataSource
gridTickets.DataBind();

And this is the method

protected void OnGridDataBound(object sender, GridRowEventArgs e)
{
    Label lb = new Label();
    lb.Attributes.Add("class", "fa fa-circle");
    lb.Attributes.Add("style", "color:red; float:right; margin-top:-17px; margin-right:10px;");

    for (int i = 0; i < e.Row.Cells.Count; i++)
    {
        DateTime checkdate = Convert.ToDateTime(e.Row.Cells[7].Text);
        DateTime checkdateL1 = checkdate.AddHours(6);
        DateTime checkdateL2 = checkdate.AddHours(12);
        DateTime checkdateL3 = checkdate.AddHours(48);

        if (e.Row.Cells[i].Text == "Level 1" && DateTime.Now >= checkdateL1)
        {
            e.Row.Cells[2].Controls.Add(lb);
        }
        if (e.Row.Cells[i].Text == "Level 2" && DateTime.Now >= checkdateL2)
        {
            e.Row.Cells[2].Controls.Add(lb);
        }
        if (e.Row.Cells[i].Text == "Level 3" && DateTime.Now >= checkdateL3)
        {
            e.Row.Cells[2].Controls.Add(lb);
        }
    }
}