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Where to Call Sorting and Paging methods From with asp:Gridview

Posted on 2007-11-30
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Last Modified: 2013-11-26
Im using the following code in my BindData() function:
I just need to know where I can call my Sorting and Paging methods from with this code:
Maybe Im not understanding this correctly, but, I start off with a DataReader and unload it to a DataTable but then I have to convert to a DataView to Sort the table.
Is there any way around this if Im using an SqlDataSource entirely through code?
I have a rowfilter I want to apply to my dataset but I dont know where before I rebind the gridview.
Thanks
John
Sub BindData(ByVal GetFresh As Boolean, Optional ByVal TextSearch As Boolean = False, Optional ByVal Pageindexchange As Boolean = False)
            Try
                If GetFresh = True And TextSearch = False Then
                    strFilter = "All"
                End If
                Dim myConn2 As SqlConnection = New SqlConnection(ConfigurationManager.AppSettings("connectionString").ToString())
                Dim myComm2 As SqlCommand = New SqlCommand()
                myComm2.Connection = myConn2
                strId = Me.ddlLocation.SelectedValue
                If strId = 0 Or strId = "" Then
                    myComm2.CommandText = "SelectClients"
                Else
                    myComm2.CommandText = "SelectClientsByLocation"
                End If
                myComm2.CommandType = CommandType.StoredProcedure
                myConn2.Open()
                rdr2 = myComm2.ExecuteReader()
                'change datasource from datareader to datatable
                Dim DT As New DataTable()
                'Load Data from Data Reader to DataTable object
                DT.Load(rdr2)
                lblCount.Text = DT.Rows.Count
                lblSort.Text = GridViewSortDirection
                dataTableRowCount = DT.Rows.Count
 
                If dataTableRowCount > 0 Then
                    gvAddress.DataSource = DT
                    gvAddress.DataBind()
                End If
 
                'Dim ds1 As DataSet = Nothing
                Dim nDT As DataView
                'ds1 = convertDataReaderToDataSet(rdr2)
                'nDT = ds1.Tables(0).DefaultView
 
                nDT = SortDataTable(DT, Pageindexchange)
                lblDir.Text = nDT.Sort
 
                If strId = CStr(0) Or strId = "" Then  ' 0 for all locations
                    If strFilter = "All" Then
                        nDT.RowFilter = String.Empty
                    Else
                        nDT.RowFilter = "ContactLastName LIKE '" & Trim(strFilter) & "%' "
                    End If
                Else
                    If strFilter = "All" Then
                        nDT.RowFilter = "LocationID=" & Trim(strId)
                    Else
                        nDT.RowFilter = "ContactLastName LIKE '" & Trim(strFilter) & "%'  and LocationID=" & Trim(strId)
                    End If
                End If
--------------------------------------------------
--generic sorting and paging routines:
        Protected Function SortDataTable(ByVal dataTable As DataTable, ByVal isPageIndexChanging As Boolean) As DataView
            If Not dataTable Is Nothing Then
 
                Dim dataView As DataView = New DataView(dataTable)
                If GridViewSortExpression <> String.Empty Then
                    If isPageIndexChanging Then
                        'dataView.Sort = String.Format("{0} {1}", GridViewSortExpression, GridViewSortDirection)
                        dataView.Sort = GridViewSortExpression + " " + GridViewSortDirection
                    Else
                        dataView.Sort = GridViewSortExpression + " " + GetSortDirection()
 
                        'dataView.Sort = String.Format("{0} {1}", GridViewSortExpression, GetSortDirection())
                    End If
                End If
                Return dataView
            Else
                Return New DataView()
            End If
        End Function
---------------------------------------------------
        Private Function GetSortDirection() As String
            Select Case GridViewSortDirection
                Case "ASC"
                    GridViewSortDirection = "DESC"
                Case "DESC"
                    GridViewSortDirection = "ASC"
            End Select
            Return GridViewSortDirection
        End Function
 
        Private Property GridViewSortDirection() As String
            Get
                Return IIf(ViewState("SortDirection") = Nothing, "ASC", ViewState("SortDirection"))
            End Get
            Set(ByVal value As String)
                ViewState("SortDirection") = value
            End Set
        End Property
 
        Private Property GridViewSortExpression() As String
            Get
                Return IIf(ViewState("SortExpression") = Nothing, String.Empty, ViewState("SortExpression"))
            End Get
            Set(ByVal value As String)
                ViewState("SortExpression") = value
            End Set
        End Property

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Question by:jtrapat1
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by:
Alpesh Patel earned 1000 total points
ID: 20384844
Yes you can use that

now regarding sorting and paging its long to solve your code. but i can give u solutions which u can apply for your problem

your VB page has this scenario

protected sub grid_DataBind(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles grd.PageIndexChanging

bind your data here with either way no matter wheather it is with Datareader or with SqlDatasource

end sub

 Protected Sub grd_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles grd.PageIndexChanging

        grd.PageIndex = e.NewPageIndex
apply databinding here
    End Sub




 Protected Sub grd_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs) Handles grd.Sorting
apply DataBinding here with  column name   e.SortExpression.ToString
End Sub




Your ASPX page has this scenario

1.  make your grid attrribute for paging= true and for sorting=true
2. for each column set attribute SortExpression='YourColumnName'

thats it
it would definetly work
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