在asp.net中，我无法将主键值从一个表单传递到另一个表单

我无法将主键值从一个窗体传递到另一个窗体，并且我没有使用gridview

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();
    string id = HF_Reg_Id.Value.ToString();
    Response.Redirect("VanRegister.aspx?id= "+id);
}

我有两个表DriverRegistration和VanRegistration。当驾驶员填写驾驶员登记表并提交时，面包车登记表将打开，并在VanRegistration表中插入DriverReg_id。所以这就是为什么我想通过查询字符串传递DriverReg_id。

DriverRegistration表的存储过程

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
    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