Pesquisar dados no banco de dados

    SqlDataReader sdrDatanew = null;
    string strnew;
    string connectionString = WebConfigurationManager.ConnectionStrings["Gen_LicConnectionString"].ConnectionString;
    SqlConnection connew = new SqlConnection(connectionString);
    connew.Open();
    strnew = "select User_Type from User_Details where User_Type='" + ddlUserSel.SelectedItem.Value + "' AND LoginID = '" + txtUserName.Text + "' AND Password = '" + txtPassword.Text + "'";
    SqlCommand sqlCommnew = new SqlCommand(strnew, connew);
    sdrDatanew = sqlCommnew.ExecuteReader();

    int userType = 0;

    if (sdrDatanew.HasRows)
    {
        if (sdrDatanew.Read())
        {
            userType = Convert.ToInt32(sdrDatanew["User_Type"].ToString());
        }
    }

    switch (userType)
    {
        case 0:
            Response.Redirect("Lic_Gen.aspx");
            break;
        case 1:
            Response.Redirect("Cust_Page.aspx");
            break;
        default:
            Console.WriteLine("Invalid User/Password");
            Console.ReadLine();
            break;
    }

    connew.Close();