Capture Return Value From Stored Procedure, Use Same In Code Behind Page

My stored procedure works and codes is working except I need to capture the return value from the stored procedure and use that value in my code behind page to indicate that a duplicate record entry was attempted.  In my code behind file (VB) how would I capture the value "@myERROR" then display in the label I have that a duplicate entry was attempted.

Stored Procedure
CREATE PROCEDURE dbo.usp_InsertNew
 @IDNumber         nvarchar(25),
 @ID  nvarchar(50),
 @LName  varchar(50),
 @FName  varchar(50)


AS

 DECLARE @myERROR int    -- local @@ERROR
      , @myRowCount int  --local @@rowcount
BEGIN
  -- See if a contact with the same name and zip code exists
 IF EXISTS (Select * FROM Info
   WHERE ID = @ID)
   
BEGIN
    RETURN 1
END
 ELSE
BEGIN TRAN
   
 INSERT INTO Info(IDNumber, ID, LName,
            FName) VALUES (@IDNumber, @ID, @LName,
            @FName)
             SELECT @myERROR = @@ERROR, @myRowCount = @@ROWCOUNT
 If @myERROR !=0 GOTO HANDLE_ERROR

                              
 
COMMIT TRAN
 RETURN 0
 
HANDLE_ERROR:
  ROLLBACK TRAN
  RETURN @myERROR  
  
END
GO

asp.net page
<asp:SqlDataSource ID="ContactDetailDS" runat="server" ConnectionString="<%$ ConnectionStrings:EssPerLisCS %>"
            SelectCommand="SELECT * FROM TABLE_One"
           
            UpdateCommand="UPDATE TABLE_One WHERE ID = @ID"
           
            InsertCommand="usp_InsertNew" InsertCommandType="StoredProcedure">
           
            <SelectParameters>
                <asp:ControlParameter ControlID="GridView1" Name="ID" PropertyName="SelectedValue" />
            </SelectParameters>
           
 </asp:SqlDataSource>