ASP.NET

<br />
try<br />
{<br />
    string isAlive = Session["userId"].ToString();<br />
}<br />
catch(Exception) //The session var is out<br />
{<br />
    Response.Redirect("error.aspx"); //Page with the time out message<br />
}<br />

<br />
private void DataGrid_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)<br />
		{<br />
			string userId = DataGrid.DataKeys[e.Item.ItemIndex].ToString();<br />
			string query = "DELETE FROM users WHERE Id = '" + userId + "'";<br />
			SqlCommand commandSql = new SqlCommand(query, conection);<br />
			vG.conexion.Open();<br />
			comandoSql.ExecuteNonQuery();<br />
			vG.conexion.Close();<br />
        }<br />

<br />
<br />
private void DataGrid_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)<br />
		{<br />
                     DataSet dS = new DataSet();<br />
                     SqlDataAdapter dA = new SqlDataAdapter();<br />
			string query = "SELECT * FROM users";<br />
			SqlCommand commandSql = new SqlCommand(query, conection);<br />
			dA.SelectCommand = comandSql;<br />
			dA.Fill(dS);<br />
			SqlCommandBuilder sCB = new SqlCommandBuilder(dA);<br />
			dS.Tables[0].Rows[e.Item.ItemIndex].Delete();<br />
			dA.Update(dS);<br />
			Response.Redirect("Usuario_delete_ok.aspx");<br />
}<br />