How do I hide a column in a GridView

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I'm trying to hide a column in a GridView. I've a template field in my GridView. Code that I'm applying to hide the desired column works well without having template field in the GridView. But because I need to have template field in my GridView, when I add it, code is giving error.

GridView (.aspx) code:

ASP.NET

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" PageSize="5" AutoGenerateColumns="True" CellSpacing="4" AutoGenerateDeleteButton="True" AutoGenerateEditButton="True" CellPadding="4" DataKeyNames="File_Name" GridLines="None" OnRowEditing="GridView1_RowEditing" OnRowDeleting="GridView1_RowDeleting" OnRowUpdating="GridView1_RowUpdating" ForeColor="#333333" OnRowCancelingEdit="GridView1_RowCancelingEdit" OnPageIndexChanging="GridView1_PageIndexChanging" AllowSorting="True" OnSorting="GridView1_Sorting" OnRowCommand="GridView1_RowCommand" OnRowDataBound="GridView1_RowDataBound" OnRowCreated="GridView1_RowCreated">
                        <PagerSettings Mode="NumericFirstLast" FirstPageText="First" LastPageText="Last" PageButtonCount="10" Position="Bottom" />
                        <AlternatingRowStyle BackColor="White" />
                        <Columns>
                            <asp:TemplateField HeaderText="File">
                                <ItemTemplate>
                                    <asp:LinkButton ID="lnkbtnFileName" runat="server" CommandArgument='<%# Eval("File_Name") %>' CommandName="Download" Text='<%# Eval("File_Name") %>'></asp:LinkButton>
                                </ItemTemplate>
                            </asp:TemplateField>
                        </Columns>
                        <EditRowStyle BackColor="#2461BF" />
                        <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                        <RowStyle BackColor="#EFF3FB" />
                        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
                        <SortedAscendingCellStyle BackColor="#F5F7FB" />
                        <SortedAscendingHeaderStyle BackColor="#6D95E1" />
                        <SortedDescendingCellStyle BackColor="#E9EBEF" />
                        <SortedDescendingHeaderStyle BackColor="#4870BE" />
                    </asp:GridView>

.cs code for PageLoad() event is:

C#

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                SqlConnection con = new SqlConnection("Data Source=MEHDI-PC\\SQLEXPRESS; Initial Catalog=PIMS; Integrated Security=true;");
                {
                    using (SqlCommand cmd = new SqlCommand())
                    {
                        String sql = "select * from dbo.Documents";
                        cmd.Connection = con;
                        cmd.CommandText = sql;
                        con.Open();
                        DataSet ds = new DataSet();
                        using (SqlDataAdapter adp = new SqlDataAdapter(cmd))
                        {
                            adp.Fill(ds);
                        }
                        DataTable mytable = ds.Tables[0];
                        GridView1.DataSource = mytable;
                        GridView1.DataBind();
                        MultiView1.SetActiveView(vHome);
                        btnBacktoHome.Visible = false;
                        lblStatus.Visible = false;
                    }
                }
            }

RowCreated() event code is:

C#

protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
    DataTable myGridDataTable = null;
    TableCell tblcell1;
    myGridDataTable = (DataTable)((GridView)sender).DataSource;
    if (myGridDataTable != null)
    {
        tblcell1 = e.Row.Cells[myGridDataTable.Columns["DocumentsID"].Ordinal];
        tblcell1.Visible = false;
    }

}

Above code runs and brings desired results if I remove <templatefield> from <gridview1> .aspx code. Can anyone tell me why number of enumerated cells in `e.Row.Cells` in GridView1_RowCreated() event is 1 when myGridDataTable is filled with datatable having 25 columns. ? Thanks in advance.

Posted 4-Sep-14 9:20am

rf_libra

Updated 5-Sep-14 2:04am

v3

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Comments

kbrandwijk 4-Sep-14 19:46pm

This is an ASP.NET question, please tag it as such to improve visibility of your question to the right audience.

[no name] 5-Sep-14 1:23am

@kbrandwijk , ASP.NET tag is added with above question. Thanks

2 solutions

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kbrandwijk · Answer 1 · 2014-09-04T13:45:00

Without knowing which error you're actually getting, these things are wrong with the current code:

1. Your template column will appear to the left of the other columns, so compared to the Ordinal in your datasource, there is a +1 offset on all auto-generated columns
2. You should probably check the rowtype in your RowCreated event handler to see if it is a datarow or headerrow, because you will only have the cells in these rows:

C#

e.Row.RowType == DataControlRowType.Header || e.Row.RowType == DataControlRowType.DataRow

It would help however, to actually see the error message that you're getting. I never understand why people say there's an error message, don't include it in their post, and expect the right solution...

chidura · Answer 2 · 2014-09-05T00:42:00

Solution 3

Hi,

make that cell invisible(i.e visible=false) in rowdatabound event
it is the best way.

ex:

protected void Gridview1_RowDataBound(object sender, GridViewRowEventArgs e)
{
GridViewRow gr = e.Row;
if (e.Row.RowType == DataControlRowType.Header)
{
gr.Cells[i].Visible = false;
}
else if (e.Row.RowType == DataControlRowType.DataRow)
{
gr.Cells[i].Visible = false;
}
}

here i referes inidex of the cell.

Posted 5-Sep-14 0:42am

chidura

Comments

[no name] 5-Sep-14 7:29am

@chidura Thanks for your response but your proposed solution only works well with column indexes. What if I want to hide a column by its "name"?

chidura 9-Sep-14 1:15am

use for loop for row in that event.. in that loop, use if condition to find the required column name.. once find then u can invisible that particular cell.