grazie per la risposta.

questo il codice del GV

sqlCMD.CommandText = "SELECT * FROM data";
SqlDataAdapter adapter = new SqlDataAdapter(sqlCMD);
DataSet ds = new DataSet();
adapter.Fill(ds);
GridViewSearch.Visible = true;
GridViewSearch.DataSource = null;
GridViewSearch.DataSource = ds;
GridViewSearch.AutoGenerateColumns = false;
//GridViewSearch.AutoGenerateSelectButton = true;
GridViewSearch.AllowSorting = true;
GridViewSearch.AllowPaging = true;
GridViewSearch.CssClass = "grid";
GridViewSearch.PagerSettings.Visible = false;
GridViewSearch.DataBind();
GridViewSearch.Columns[0].Visible = false;