Sqlcommand And Visual Studio Net 2003 Code To Update A Record With A Click Of Button.

Hello to everyone,
  I have this problem If I use this code when I try to update a record in my sql database It does not do anything. This is the code.

  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim myconn As New SqlConnection("Data Source=.;Initial Catalog=SistemaIntegral; user id=sa")
        Dim mycmd As New SqlCommand("presup", myconn)
        mycmd.CommandType = CommandType.StoredProcedure
mycmd.parameters.Add(New SqlParameters("@txtClave", SqlDbtype.int,4)).Value=txtClave.text
mycmd.parameters.Add(New SqlParameters("@txtForig", SqlDbtype.varchar,50)).Value=txtFOrig.text
mycmd.parameters.Add(New SqlParameters("@txtFmod", SqlDbtype.varchar,50)).Value=txtFmod.text
mycmd.parameters.Add(New SqlParameters("@txtFeje", SqlDbtype.varchar,50)).Value=txtFeje.text
mycmd.parameters.Add(New SqlParameters("@txtPorig", SqlDbtype.varchar,50)).Value=txtPorig.text
mycmd.parameters.Add(New SqlParameters("@txPmod", SqlDbtype.varchar,50)).Value=txtPmod.text
mycmd.parameters.Add(New SqlParameters("@txtPeje", SqlDbtype.varchar,50)).Value=txtPeje.text

mycmd.parameters.Add(New SqlParameters("@txtClave", SqlDbtype.int,4)).Value=txtClave.text

        myconn.Open()
        mycmd.ExecuteNonQuery()
        myconn.Close()

        mycmd.Dispose()
        myconn.Dispose()

    End Sub
 
This is the code for the procedure called "presup" in SQL 2000 Server.
CREATE PROCEDURE [presup]
(@txtClave [int],
@txtForig [varchar](50),
@txtFmod [varchar](50),
@txtFeje [varchar](50),
@txtPorig [varchar](50),
@txtPmod [varchar](50),
@txtPeje [varchar](50),
@txtIdPresupuesto [int]
)

as Update [Presupuesto]

Set [IdClave]=@txtClave,
[orig]=@txtForig,
[moda]=@txtFmod,
[ejer]=@txtFEje,
[origr]=@txtPorig,
[modar]=@txtPmod,
[ejerr]=@txtPeje


Where
([IdPresupuesto]=@txtIdPresupuesto)
GO
 
When I click the Update button of my webform it does not do anything.
 
Please Help me I am new to Visual Studio.Net 2003. (2 weeks ago I started using Visual Studio)