how-to hide a column in gridview

//how-to hide columns from GridView -
//add (OnRowCreated="OnRowCreated") in your gridview declarative syntax
//in this example the second column is hidden
//add also to the css file of the aspx page ( .hiddencol {display:none;} )
protected void OnRowCreated(object sender, GridViewRowEventArgs e)
{

if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Cells[1].CssClass = "hiddencol";
}
else if (e.Row.RowType == DataControlRowType.Header)
{
e.Row.Cells[1].CssClass = "hiddencol";
}
} //eof method OnRowCreated ( object sender, GridViewRowEventArgs e )