Question

Friends, I’m populating a GridView in my asp.net application using following code.

    GridView grdExport = new GridView();
    DataSet dsRecord = objHelper.gReturnDataSet(CommandType.Text, strSql);

    grdExport.DataSource = dsRecord.Tables[0];
    grdExport.DataBind();

Now the problem is in immediate window, when I’m checking, I’m getting following result:

    ?dsRecord.Tables[0].Columns.Count
    16
    ?dsRecord.Tables[0].Rows.Count
    37
    ?grdExport.Rows.Count
    37
    ?grdExport.Columns.Count
    0

Please, can anyone tell me why Column count is 0 for grdExport?

Answer 1

GridView.Columns Property

Check this:

The Columns property (collection) is used to store all the explicitly
declared column fields that get rendered in the GridView control. You
can also use the Columns collection to programmatically manage the
collection of column fields.

If you have more columns to your added columns in your grid then it will show count of those columns which you have added not the auto generated columns.

If you show auto generated columns then it will show 0.
Check this markup:

 <asp:GridView ID="GridView1" runat="server">
            <Columns>
                <asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID" />
            </Columns>
        </asp:GridView>

Now it will Show your result of columns’s count to 1:
//Before adding column to gridview

?dtResult.Rows.Count
9
?dtResult.Columns.Count
2
?GridView1.Rows.Count
9
?GridView1.Columns.Count
0

After Adding column to gridview.

?GridView1.Columns.Count
1