Question

I have a gridview with paging enabled and a textbox where the user can enter a string value used to select the row in the gridview with a column that matches the string value. The column’s data is not the primary key and is not listed in the datakeynames.

I’ve found an example that solves the problem for a non-paging gridview. In an event handler for a button control associated with the textbox:

    protected void SelFrame_Clicked(object sender, EventArgs e)
    {
        string requestedFrame = tbSelFrame.Text;
        if (requestedFrame != "")
        {
            int index = (from DataControlField col in gvFrame.Columns
                            where col.HeaderText == "Name"
                            select gvFrame.Columns.IndexOf(col)).FirstOrDefault();

            var query = from GridViewRow row in gvFrame.Rows
                        where row.Cells[index].Text == requestedFrame
                        select row;
            GridViewRow result = query.FirstOrDefault();
            if (result != null)
            {
                int selectedIndex = result.DataItemIndex;
                if (selectedIndex > -1)
                    gvFrame.SelectedIndex = selectedIndex;
            }
        }
    }

As noted, when the value being searched is on a non-visible page of the gridview, this line returns null:

 GridViewRow result = query.FirstOrDefault();

How can I find the matching row in a gridview with paging enabled?

Answer 1

You should add the value as a datakey instead, and then do something like this:

gvFrame.SelectedIndex = gvFrame.Rows.Cast<GridViewRow>().First(r => 
    (string)gvFrame.DataKeys[r.RowIndex]["foo"] == requestedFrame).RowIndex;