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asp.net making a gridView column invisible

This is a Master-Detail form. Master is a GridView. And, the Detail is a DetailsView.

The entire thing is achieved programmatically.

As you can see from the code, DetailsView is using the Master-objects's ID to retrieve the Detail items.

I need to make the ID column of the Master-GridView invisible. Coz, it is irrelevent for the user of the page. But it must not harm the page logic.

But the code-line, GridView1.Columns[1].Visible = false; is generating an exception.

Index was out of r开发者_如何转开发ange. Must be non-negative and less than the size of the collection.
Parameter name: index

How should I solve this problem?

public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindData();
            }
        }

        protected void BindData()
        {
            List<Order> orders = Order.Get();

            GridView1.DataSource = orders;
            GridView1.DataBind();

            // This is giving Error...............!!!
            GridView1.Columns[1].Visible = false;

            // At first, when the page first loads, 
            //      GridView1.SelectedIndex == -1
            // So, this is done to automatically select the 1st item.
            if (GridView1.SelectedIndex < 0)
            {
                GridView1.SelectedIndex = 0;
            }

            int selRowIndex = GridView1.SelectedIndex;

            int selMasterId = Convert.ToInt32(GridView1.Rows[selRowIndex].Cells[1].Text);

            Order master = Order.Get(selMasterId);

            labItemsCount.Text = master.Items.Count.ToString();

            DetailsView1.DataSource = master.Items;
            DetailsView1.DataBind();            
        }

        protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            BindData();
        }

        protected void DetailsView1_PageIndexChanging(object sender, DetailsViewPageEventArgs e)
        {
            DetailsView1.PageIndex = e.NewPageIndex;

            BindData();
        }
    }

asp.net making a gridView column invisible


Have you considered using the DataKeyNames property of the gridview? This way you can remove the 'id' column from the GridView bu still access the 'id' value in the Page_Load.

DataKeyNames = "id"

Then you can get the value of the id like this.

int selRowIndex = GridView1.SelectedIndex;
int selMasterId = Convert.ToInt32(GridView.DataKeys[selRowIndex].Value);
Order master = Order.Get(selMasterId);

Alternately, you could try changing the visibility of the column in the OnRowBound event of the GridView.

protected void GridView_RowDataBound(object sender,   GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.Header ||
        e.Row.RowType == DataControlRowType.DataRow ||
        e.Row.RowType == DataControlRowType.Footer)
    {
        e.Row.Cells[1].Visible = false;
    }
}
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