protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { if (con.State == ConnectionState.Closed) { con.Open(); } SqlCommand sqlcmd1 = new SqlCommand("select make from cars ", con); DropDownMake.DataSource = sqlcmd1.ExecuteReader(); DropDownMake.DataBind(); con.Close(); if (con.State == ConnectionState.Closed) { con.Open(); } SqlCommand sqlcmd2 = new SqlCommand("select model from cars ", con); DropDownModel.DataSource = sqlcmd2.ExecuteReader(); DropDownModel.DataBind(); con.Close(); if (con.State == ConnectionState.Closed) { con.Open(); } SqlCommand sqlcmd3 = new SqlCommand("select style from cars ", con); DropDownStyle.DataSource = sqlcmd3.ExecuteReader(); DropDownStyle.DataBind(); con.Close(); con.Close(); if (con.State == ConnectionState.Closed) { con.Open(); } SqlCommand sqlcmd4 = new SqlCommand("select year from cars ", con); DropDownYear.DataSource = sqlcmd4.ExecuteReader(); DropDownYear.DataBind(); con.Close(); } }