Problem with GridView (invisible columns)

private DataTable CreateTable()

try

DataTable table = new DataTable();

// Declare DataColumn and DataRow variables.

DataColumn column;

// Create new DataColumn, set DataType, ColumnName

// and add to DataTable.

column = new DataColumn();

column.DataType = System.Type.GetType("System.String");

column.ColumnName = "a";

// Create second column.

column = new DataColumn();

column.DataType = Type.GetType("System.String");

column.ColumnName = "b";

// Create second column.

column = new DataColumn();

column.DataType = Type.GetType("System.String");

column.ColumnName = "c";

return table;

catch (Exception ex)

throw new Exception(ex.Message);

protected void Page_Load(object sender, EventArgs e)

if (!IsPostBack)

DataTable dc = CreateTable();

DataRow dr;

dr["a"] = "Hallo1";

dr["b"] = "Hallo2";

dr["c"] = "Path1";

dr["a"] = "Hallo3";

dr["b"] = "Hallo4";

dr["c"] = "Path2";

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)

if (e.CommandName == "show")

int index = Convert.ToInt32(e.CommandArgument);

GridViewRow selectedRow = GridView1.Rows[index];

TableCell a = selectedRow.Cells[2];

String s = a.Text;

Label1.Text = "" + s + "";

<asp:BoundField DataField="b" HeaderText="Quelle" Visible="True">

<HeaderStyle HorizontalAlign="Left" />

asp:BoundField>

the correct content is returned.

But I have to make this column invisible, because I need to store extra data with every row that I don't want to show in the gridview.

Any idea what I am doing wrong?