在动态基础设施网格中隐藏列并更新标题

Question

I have a infragistics grid that gets data when a dropdown is changed 1- i want to hide the last column every time the grid is loaded with data 2- i also want to update header according to data

problem I am trying

     protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        EntityName.Text = DropDownList1.SelectedItem.Text;
        string entity = "t_" + DropDownList1.SelectedItem.Text;
        String strConnString = ConfigurationManager.ConnectionStrings["LiveLeaseConnectionString"].ConnectionString;
        SqlConnection con = new SqlConnection(strConnString);
        SqlCommand cmd = new SqlCommand("p_DataList_ByRegardingObject", con);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@RegardingObjectName", entity);
        SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        sqlDataAdapter.Fill(dt);
        this.EntityGrid.DataSource = dt;
        this.EntityGrid.Columns[6].Hidden = true;

its throwing null reference error and it doesnt seem to update column names each time it loads data.data is getting refreshed but not the column names. here is my aspx

    <asp:DropDownList ID="DropDownList1" AutoPostBack="true" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
   <asp:ListItem>Select Entity</asp:ListItem>
</asp:DropDownList>
<asp:Label runat="server" ID="EntityName"></asp:Label>
<ig:WebScriptManager ID="WebScriptManager1" runat="server"></ig:WebScriptManager>
<ig:WebDataGrid ID="EntityGrid" runat="server"  Width="100%" Height="50%" StyleSetName="Claymation" >

    <Behaviors>
        <ig:Sorting>
        </ig:Sorting>

    </Behaviors>
    <ClientEvents Click="NavigateOnClick" />
</ig:WebDataGrid>   

Answer 1

If your AutogenerateColumns is True - grid column collection will be empty. The trick is to get to the column via Grid Rows.

After grid is bound try this:

this.EntityGrid.Rows[0].Items[6].Column.Hidden = true;

Just make sure that grid has at least one row.