I have this code in one of my pages that works fine.

 protected void ddlApprovedStatus_SelectedIndexChanged(object sender, EventArgs e)
    {
        DropDownList ddl = (DropDownList) sender; 

        if (ddl.SelectedIndex == 1 ) // Approved 
        {
         //   this.ProfilesGrid.Columns[0].Visible = false;
            this.ProfilesGrid.Columns[1].Visible = false;
            this.ProfilesGrid.Columns[4].Visible = true;            
        }
        else
        {
         //   this.ProfilesGrid.Columns[0].Visible = true;
            this.ProfilesGrid.Columns[1].Visible = true;
            this.ProfilesGrid.Columns[4].Visible = false;
            
        }

>Dear all:
>
>Using Visual Web Developer I bound my query result to a grid view and activate the multi view page the grid view is on with the following code:
>

>                GrdView.DataSource = myRead;
>                GrdView.DataBind();
>                MultiView1.ActiveViewIndex = 10;
>

>But there are some columns of my query result that I do not want to show in the grid view but which their values are of important later for selection of records in the grid view.
>
>What can I do for the columns that I do not want to show in the grid not to show and retrieve their values when selecting there selected records for the grid view?
>
>
>I tried the following:
>
>1)
>

GrdView.Columns[3].Visible = false;

>but this did not make the column invisible.
>
>2)
>

>for (int i = 0; i < GrdView.Rows.Count; i++)
>        GrdView.Rows[i].Cells[3].Visible = false;
>

>But this will move all the values of the columns following column 3 to the one column before them and the column header won’t change and also the last column has no value but the header that stayed.
>
>Thank you for your help in advance.