question about excute store procedure

Hi, all

i create a function("changefilepermission") to execute a procedure ("grant_file_access") to change the file permission. i click the permission checkbox to change new permission, after that i will click the submit button to update change to the database. but it does not change to the database. this is my part of code. is anybody can give me a help?

thanks in advanced!!!!!!!!!

Private Sub btnsubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSubmit.Click
 Dim FileTitle As New String("")
 Dim FileName As New String("")
 FileName = DGPermission.Items.Item(0).Cells(0).Text 'retrieve filename from datagrid
 FileTitle = DatabaseCommand(userid, "fa_title", filename) ' retrieve the filetitle from table
 Dim permission As Char ' set the permission value
 If (CkRead.Checked) Then
 Permission = "r"
 ElseIf (CkWrite.Checked) Then
 Permission = "w"
 ElseIf (CkExecute.Checked) Then
 Permission = "o"
 End If
 Try
 ' call the store procedure function by passing 4 value
 ChangeFileAccess(userid, FileName, FileTitle, Permission) '
 Catch ex As Exception
 lblErrorMsg.Text = ex.ToString
 End Try
End Sub
' execute store procedure function
Public Sub ChangeFileAccess(ByVal userid As String, ByVal DiskFilename As String, ByVal Title As String, ByVal Access As Char)
 Dim UpdateCommand As SqlCommand
 UpdateCommand = New SqlCommand
 With UpdateCommand
 .Connection = SqlConnection
 .CommandType = CommandType.StoredProcedure
 .CommandText = "Grant_File_Access"
 .Parameters.Add("@.vu_id", SqlDbType.VarChar, 20).Value = userid
 .Parameters.Add("@.DiskFilename", SqlDbType.VarChar, 64).Value = DiskFilename
 .Parameters.Add("@.Title", SqlDbType.VarChar, 50).Value = Title
 .Parameters.Add("@.Access", SqlDbType.Char, 1).Value = Access
 End With
 Try
 UpdateCommand.Connection.Open()
 UpdateCommand.ExecuteReader() ' call the store procedure
 UpdateCommand.Connection.Close()
 Catch ex As Exception
 lblErrorMsg.Text = ex.ToString
 End Try
 End Sub

What does your stored procedure look like?

Terri