there is two form when driver register successfully then Van register form open, so i want to a driver id in van table 
ALTER PROC [dbo].[SP_INSERT_DriverRegistration]
@DriverReg_id as int,
@Fname varchar(50),
@Lname varchar(50),
@Email varchar(50),
@Password varchar(50),
@Gender varchar(50),
@Mobile varchar(50),
@CNIC varchar(50),
@Address varchar(50),
@DrivingExperience varchar(50),
@license varchar(50),
@Route varchar(50)
As
BEGIN
IF @DriverReg_id =-1 --FOR INSERTION IF CONDITION TRUE
if exists(select top 1 DriverReg_id from DriverRegistration where Fname=@Fname and Mobile=@Mobile)
	begin
		select -1
	end
	else begin
	INSERT INTO DriverRegistration(
		Fname
		,Lname
		,Email
		,Password
		,Gender
		,Mobile
		,CNIC
		,Address
		,DrivingExperience
		,license
		,Route
		,CreatedOn	
		,CreatedBy	
		,UpdatedBy	
		,UpdatedOn	
		,IsActive	
		,IsVerified	)
		values(
		@Fname
		,@Lname
		,@Email
		,@Password
		,@Gender
		,@Mobile
		,@CNIC
		,@Address
		,@DrivingExperience
		,@license
		,@Route
		,GETDATE()
		,1
		,null
		,null
		,1
		,0
		)
	
		select SCOPE_IDENTITY() 
	End
	ELSE BEGIN
UPDATE DriverRegistration
SET
 Fname=@Fname
,Lname=@Lname
,Email=@Email
,Password=@Password
,Gender=@Gender
,Mobile=@Mobile
,CNIC=@CNIC
,Address=@Address
,DrivingExperience=@DrivingExperience
,license=@license
,Route=@Route
,UpdatedOn=GETDATE()
,UpdatedBy=1
 WHERE DriverReg_id=@DriverReg_id
END
END	
  public partial class VanRegister : System.Web.UI.Page
    {
        string conString = System.Configuration.ConfigurationManager.ConnectionStrings["myConstring"].ToString();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request.QueryString.Count > 0)
            {
                HF_DriverReg_id.Value = Request.QueryString["DriverReg_id"].ToString();
            }
        }
                     SqlConnection con = new SqlConnection(conString);
                    SqlCommand cmd = new SqlCommand("SP_INSERT_VanRegistration", con);
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.Add("@VanReg_id", HF_Van_Id.Value);
                    cmd.Parameters.Add("@DriverReg_id", HF_DriverReg_id.Value);
                    cmd.Parameters.Add("@VehicleNumber", VehicleNumber.Text);
                    cmd.Parameters.Add("@VehicleModel", VehicleModel.Text);
                    cmd.Parameters.Add("@VehicleType", VehicleType.Text);
                    cmd.Parameters.Add("@SeatsNumbers", SeatsNumbers.Text);
                    cmd.Parameters.Add("@VehicleImage", VehicleImage);
                    cmd.Parameters.Add("@EmpImgPath", "EmpImages/" + VehicleImage);
                    con.Open();
                   string result = cmd.ExecuteNonQuery().ToString();
                    con.Close();
                    con.Dispose();
                    int num = int.Parse(result);
                    if (result == "1")
                    {
                    lblMsg.Text = "Registered successfully we will send you a confirmation email soon";
                   
                    }
                    else
                    {
                        lblMsg.Text = "Alreday exixts";
                    }
 
same for Driver
        protected void btnRegister_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(conString);
            SqlCommand cmd = new SqlCommand("SP_INSERT_DriverRegistration", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Add("@DriverReg_id", HF_Reg_Id.Value);
            cmd.Parameters.Add("@Fname", Fname.Text);
            cmd.Parameters.Add("@Lname", Lname.Text);
            cmd.Parameters.Add("@Email", Email1.Text);
            cmd.Parameters.Add("@Password", Password.Text);
            cmd.Parameters.Add("@Gender", Gender.Text);
            cmd.Parameters.Add("@Mobile", Mobile.Text);
            cmd.Parameters.Add("@CNIC", CNIC.Text);
            cmd.Parameters.Add("@Address", Address.Text);
            cmd.Parameters.Add("@DrivingExperience", DrivingExperience.Text);
            cmd.Parameters.Add("@license", license.Text);
            cmd.Parameters.Add("@Route", ddlRoute.SelectedItem.Text);
            con.Open();
            string result = cmd.ExecuteNonQuery().ToString();
            con.Close();
            int num = int.Parse(result);
           // if (result == "1")
            if (num > 1)
            {
                //lblMsg.Text = "registered successfully we will send you a confirmation email soon";
                Response.Redirect("VanRegister.aspx");
            }
            else
            {
                //lblMsg.Text = "Alreday exixts";
                Response.Redirect("VanRegister.aspx");
            }