sorting on a datagrid

Hi experts,
I am trying to sort on a datagrid.

i have performed these steps, but how come i can't still sort on the grid.
==================================================================================
   Public Property sortCriteria() As String
        Get
            Return CStr(viewstate("sortCriteria"))
        End Get
        Set(ByVal Value As String)
            ViewState("sortCriteria") = Value
        End Set
    End Property
===========================================================================
    ' Holds the direction to be sorted...
    Public Property sortDir() As String
        Get
            Return CStr(viewstate("sortDir"))
        End Get
        Set(ByVal Value As String)
            ViewState("sortDir") = Value
        End Set
    End Property
============================================================================================
    Sub dgusers_Sort(ByVal sender As Object, ByVal e As DataGridSortCommandEventArgs) Handles dgUsers.SortCommand
        ' Check to see if the column we clicked on is the current column defined
        ' in the sortCriteria property.
        If Me.sortCriteria = e.SortExpression Then
            If Me.sortDir = "desc" Then
                Me.sortDir = "asc"
            Else
                Me.sortDir = "desc"
            End If
        End If
        ' Assign the column clicked to the sortCriteria property
        Me.sortCriteria = e.SortExpression
        ' Now call the procedure to re-display the Data Grid
    End Sub
============================================================================================
#Region "LoadData Subroutine "
    Private Sub LoadData()
        'Calls the GetAllUser Function
        dgUsers.DataSource = LicenseDB.GetAllUser(Me.sortDir, Me.sortCriteria)
        dgUsers.DataBind()
    End Sub
#End Region
==========================================================
then this is the getalluser function


    'fills the datagrid with details
    Public Shared Function GetAllUser(ByVal sortDir As String, ByVal sortCriteria As String) As ArrayList
        Dim arr As New ArrayList
        Dim DBConnection As SqlConnection = Connection()
        DBConnection.Open()
        Dim cmdLicense As SqlCommand = New SqlCommand("SPR_GETALL_USERPROFILE", DBConnection)
        cmdLicense.CommandType = CommandType.StoredProcedure
        Try
            Dim drlicense As SqlDataReader
            drlicense = cmdLicense.ExecuteReader()
            While drlicense.Read()
                Dim userProfile As New UserProfile
                userProfile.userProfileID = DataUtil.IsNull(drlicense.Item("userProfileID"), "")
                userProfile.firstName = DataUtil.IsNull(drlicense.Item("firstName"), "")
                userProfile.lastName = DataUtil.IsNull(drlicense.Item("lastName"), "")
                userProfile.address1 = DataUtil.IsNull(drlicense.Item("address1"), "")
                userProfile.address2 = DataUtil.IsNull(drlicense.Item("address2"), "")
                userProfile.city = DataUtil.IsNull(drlicense.Item("city"), "")
                userProfile.state = DataUtil.IsNull(drlicense.Item("state"), "")
                userProfile.zip = DataUtil.IsNull(drlicense.Item("zip"), "")
                userProfile.email = DataUtil.IsNull(drlicense.Item("email"), "")
                userProfile.phone = DataUtil.IsNull(drlicense.Item("phone"), "")
                ' userProfile.employeeflag = DataUtil.IsNull(drlicense.Item("employeeflag"), "")
                userProfile.employeeflag = DataUtil.IsNull(drlicense.Item("employee_Non_employee"), "")
                ' userProfile.employeeflag = DataUtil.IsNull(drlicense.Item("employeeflag"), 0)
                userProfile.username = DataUtil.IsNull(drlicense.Item("username"), "")
                userProfile.password = DataUtil.IsNull(drlicense.Item("password"), "")
                arr.Add(userProfile)
            End While
            Return arr
        Finally
            DBConnection.Close()
        End Try
    End Function
============================================================
CREATE PROCEDURE dbo.SPR_GETALL_USERPROFILE
@SortColumn varchar(255),
@Direction varchar(10)
AS

declare @SQL varchar(8000)
 BEGIN
SELECT  @SQL = 'SELECT          
           userLogin.username,
           userLogin.password,
           userProfile.userProfileID,
           userProfile.firstName,
           userProfile.lastName,
           userProfile.address1,
           userProfile.address2,
           userProfile.city,
           userProfile.state,
           userProfile.zip,
           userProfile.email,
           userProfile.phone,
           userProfile.employeeflag,
         case employeeflag when 1 then "employee" else "Non employee" end as employee_Non_employee
FROM       userLogin INNER JOIN
           userProfile ON userLogin.userProfileID = userProfile.userProfileID
            ORDER BY ' + str(@SortColumn) + '  ' + @Direction
exec(@SQL)  
end
GO


how do i get my sort functionality

thanks


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