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POMaintain sorting with paging in a GridView
 

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  1. POMaintain sorting with paging in a GridView
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    <p>I'm currently trying write code that will maintain the sorting preference while changing page on a GridView. My current code is working fine to sort the data based on the user sorting selection. But when changing page, the sorting doesn't work. I don't get an error but rather unsorted results.</p> <p>Here's my aspx code:</p> <pre><code>&lt;asp:GridView ID="tblAdministrators" runat="server" AutoGenerateColumns="false" EmptyDataText="No records found" PageSize="75" AllowPaging="True" AllowSorting="True"&gt; &lt;Columns&gt; &lt;asp:BoundField HeaderText="Name" InsertVisible="False" DataField="FULLNAME" SortExpression="FULLNAME"&gt;&lt;/asp:BoundField&gt; &lt;/Columns&gt; &lt;Columns&gt; &lt;asp:BoundField HeaderText="Active" InsertVisible="False" DataField="ACTIVE" SortExpression="ACTIVE"&gt;&lt;/asp:BoundField&gt; &lt;/Columns&gt; &lt;/asp:GridView&gt; </code></pre> <p>Here's my VB code:</p> <pre><code>Public Class ViewUsers Inherits SolutionBasePage Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not Page.IsPostBack Then tblAdministrators.DataSource = GetData() tblAdministrators.DataBind() End If End Sub Private Const ASCENDING As String = " ASC" Private Const DESCENDING As String = " DESC" Private Function GetData() As Data.DataView Dim connection As OracleDBConnect = DAL.GetOracleDBConnection() Dim request As OracleDBRequest = Nothing Dim result As OracleDBResult = Nothing Dim trace As OracleDBChronoTrace = Nothing Dim status As DBStatus Dim sb As New StringBuilder Dim dv As DataView Dim ds As Data.DataSet = New Data.DataSet Try With sb .Append("SELECT FULLNAME, ACTIVE FROM USERS") End With request = New OracleDBRequest(sb.ToString, CommandType.Text) status = connection.Execute(request, result, trace) dv = New DataView(result.DataSet.Tables(0)) If (ViewState("sortExp") IsNot Nothing) Then dv = New Data.DataView(result.DataSet.Tables(0)) If (GridViewSortDirection = SortDirection.Ascending) Then GridViewSortDirection = SortDirection.Descending dv.Sort = CType(ViewState("sortExp") &amp; DESCENDING, String) Else GridViewSortDirection = SortDirection.Ascending dv.Sort = CType(ViewState("sortExp") &amp; ASCENDING, String) End If Else dv = result.DataSet.Tables(0).DefaultView End If Return dv Catch ex As Exception Finally 'ds.Dispose() 'dp.Dispose() End Try End Function Public Property GridViewSortDirection() As SortDirection Get If ViewState("sortDir") Is Nothing Then ViewState("sortDir") = SortDirection.Ascending End If Return CType(ViewState("sortDir"), SortDirection) End Get Set(ByVal value As SortDirection) ViewState("sortDir") = value End Set End Property Protected Sub tblAdministrators_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles tblAdministrators.PageIndexChanging tblAdministrators.PageIndex = e.NewPageIndex tblAdministrators.DataSource = GetData() tblAdministrators.DataBind() End Sub Protected Sub tblAdministrators_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs) Handles tblAdministrators.Sorting ViewState("sortExp") = e.SortExpression tblAdministrators.DataSource = GetData() tblAdministrators.DataBind() End Sub End Class </code></pre>
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    1. USMark Marina
    1. USMark Marina
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    1. COtry to step into the code and see what's the value of ViewState("sortExp") on PageIndexChanging. That should give you a clue.
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      1. USpinoy_ISF
    2. COThanks for the tip. When I go from page 1 to 2, the sorting is ASCENDING then from 2 to 3 it's DESCENDING. The sorting is not retained. So there's really something wrong with my code !
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