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

Posted on 2007-11-30
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.
Sub BindData(ByVal GetFresh As Boolean, Optional ByVal TextSearch As Boolean = False, Optional ByVal Pageindexchange As Boolean = False)


                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"


                    myComm2.CommandText = "SelectClientsByLocation"

                End If

                myComm2.CommandType = CommandType.StoredProcedure


                rdr2 = myComm2.ExecuteReader()

                'change datasource from datareader to datatable

                Dim DT As New DataTable()

                'Load Data from Data Reader to DataTable object


                lblCount.Text = DT.Rows.Count

                lblSort.Text = GridViewSortDirection

                dataTableRowCount = DT.Rows.Count

                If dataTableRowCount > 0 Then

                    gvAddress.DataSource = DT


                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


                        nDT.RowFilter = "ContactLastName LIKE '" & Trim(strFilter) & "%' "

                    End If


                    If strFilter = "All" Then

                        nDT.RowFilter = "LocationID=" & Trim(strId)


                        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


                        dataView.Sort = GridViewSortExpression + " " + GetSortDirection()

                        'dataView.Sort = String.Format("{0} {1}", GridViewSortExpression, GetSortDirection())

                    End If

                End If

                Return dataView


                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


                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


                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
1 Comment
LVL 10

Accepted Solution

Alpesh Patel earned 250 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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