Adding data to custom table in asp.net identity

I have added a custom table using asp identity and trying to join that with aspnetusers

public class ApplicationUser : IdentityUser

{

public virtual ICollection tblSchoolAdmin { get; set; }

public ClaimsIdentity GenerateUserIdentity(ApplicationUserManager manager)

{

// Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType

var userIdentity = manager.CreateIdentity(this, DefaultAuthenticationTypes.ApplicationCookie);

// Add custom user claims here

return userIdentity;

}

public class tblAdmin

{

[Key]

public Guid AdminID { get; set; }

public string Name { get; set; }

public DateTime Founded { get; set; }

public string UserName { get; set; }

[ForeignKey("UserName")]

public virtual ApplicationUser User { get; set; }

}

public System.Data.Entity.DbSet tblAdmindb { get; set; }

Now after I register user using asp net identity, My custom form show up which will put data in my custom data tblAdmin that I created.

My Stored Procedure:-

CREATE PROCEDURE [dbo].[Procedure]

    @AdminID    Varchar(50),

    @SchoolName Varchar (50),

    @Founded Date,

    @UserName nvarchar(128)

AS

BEGIN

    INSERT INTO tblAdmins(AdminID,Name,Founded,UserName) values (@AdminID,@SchoolName,@Founded,@UserName)

END

My Custom page code to call Stored Procedure

protected void Button1_Click(object sender, EventArgs e)

            var userName = HttpContext.Current.User.Identity.Name;

            //var UserId = HttpContext.Current.User.Identity.GetUserId();

            SqlConnection mySqlConnection = new SqlConnection("Data Source=.;Initial Catalog=AspNetIdentityFinal;Integrated Security=True");

            SqlCommand cmd = new SqlCommand();

            cmd.Connection = mySqlConnection;

            cmd.CommandType = CommandType.StoredProcedure;

            cmd.CommandText = "Procedure";

            //adding paramerters to  SqlCommand below

            Guid g;

            g = Guid.NewGuid();

            cmd.Parameters.AddWithValue("@AdminID", g);

            cmd.Parameters.AddWithValue("@SchoolName", TextBox1.Text.ToString());        //first Name

            cmd.Parameters.AddWithValue("@Founded ", TextBox2.Text);     //middle Name

            cmd.Parameters.AddWithValue("@UserName ", userName);

try

                mySqlConnection.Open();

                cmd.ExecuteNonQuery();

                Label1.Text = "Row inserted sucessfully";

            catch (Exception ex)

                Label1.Text = ex.Message;

            finally

                mySqlConnection.Close();

                mySqlConnection.Dispose();

I am trying to use Stored procedure but it keeps giving me FOREIGN Key issue because of Column User ID in table AspNetUsers. What should I do to put entry in User_ID in tblAdmins which shows as Foreign key but cannot be used in Procedure?