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Duplicate RadGrid

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Grid

This is a migrated thread and some comments may be shown as answers.

Andrey asked on 16 Dec 2011, 08:21 PM

Hello,

I am very new to ASP.Net, and I'm sure that my problem has more to do with how I implemented the updatepanel, rather than how I implemented the grid.

I have a page with two UpdatePanels. The first holds a bunch of dropdowns that get changed whenever a selection is changed. The second UpdatePanel holds a button and a RadGrid. When someone hits the button, the server is supposed to perform a query and update the grid's databinding.

Instead, when I hit the button, a second identical grid appears right next to the first one. The original grid gets the data, and the duplicate grid has no data. If I hit the button again, I get the error, "Uncaught Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException: Invalid JSON primitive: ." Telerik.Web.UI.WebResource.axd:15
aspx:

<%@ Page Title="Find Location" Language="C#" MasterPageFile="~/Site.Master"

AutoEventWireup="true" CodeBehind="FindLocation.aspx.cs" Inherits="Project1.FindLocation" %>

 

<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %> 

<%@ Register TagPrefix="telerik" Namespace="Telerik.Charting" Assembly="Telerik.Web.UI" %> 

<asp:Content ID="HeadContent" ContentPlaceHolderID="HeadContentPH" runat="server"> 

</asp:Content> 

<asp:Content ID="MainContent" ContentPlaceHolderID="MainContentPH" runat="server"> 

<div style="float: left; padding: 15px;"> 

<h2> 

Find Location</h2> 

<asp:UpdatePanel ID="FindLocationUpdatePnl" runat="server" UpdateMode="Conditional"> 

<ContentTemplate> 

<table> 

<tr> 

<td> 

<fieldset> 

<legend>General</legend> 

<table width="100%"> 

<tr> 

<td> 

Custom Identifier 

</td> 

<td> 

<telerik:RadTextBox ID="m_oCustomIdTextBox" runat="server"> 

</telerik:RadTextBox> 

</td> 

</tr> 

<tr> 

<td> 

Owned by 

</td> 

<td> 

<telerik:RadComboBox ID="m_oOwnedByComboBox" runat="server" AutoPostBack="false" 

EnableViewState="true"> 

</telerik:RadComboBox> 

</td> 

</tr> 

<tr> 

<td> 

Maintained by 

</td> 

<td> 

<telerik:RadComboBox ID="m_oMaintainedByComboBox" runat="server" OnSelectedIndexChanged="MaintainedByChanged" 

EnableViewState="true" AutoPostBack="true"> 

</telerik:RadComboBox> 

</td> 

</tr> 

</table> 

</fieldset> 

</td> 

<td> 

<fieldset> 

<legend>Has Route</legend> 

<table width="100%"> 

<tr> 

<td> 

Type 

</td> 

<td> 

<telerik:RadComboBox ID="m_oHasRouteTypeComboBox" runat="server" AutoPostBack="true" 

EnableViewState="true" /> 

</td> 

</tr> 

<tr> 

<td> 

Name or Number 

</td> 

<td> 

<telerik:RadComboBox ID="m_oNameOrNumber1" runat="server" AutoPostBack="true" EnableViewState="true" /> 

</td> 

</tr> 

</table> 

</fieldset> 

</td> 

</tr> 

<tr> 

<td> 

<fieldset> 

<legend>Region</legend> 

<table width="100%"> 

<tr> 

<td> 

County 

</td> 

<td> 

<telerik:RadComboBox ID="m_oCountyComboBox" runat="server" OnSelectedIndexChanged="CountyChanged" 

AutoPostBack="true" EnableViewState="true" /> 

</td> 

</tr> 

<tr> 

<td> 

City 

</td> 

<td> 

<telerik:RadComboBox ID="m_oCityComboBox" runat="server" OnSelectedIndexChanged="CityChanged" 

AutoPostBack="true" EnableViewState="true" /> 

</td> 

</tr> 

<tr> 

<td> 

  

</td> 

</tr> 

</table> 

</fieldset> 

</td> 

<td> 

<fieldset> 

<legend>And Has Route</legend> 

<table width="100%"> 

<tr> 

<td> 

Type 

</td> 

<td> 

<telerik:RadComboBox ID="m_oAndHasRouteTypeComboBox" runat="server" AutoPostBack="true" 

EnableViewState="true" /> 

</td> 

</tr> 

<tr> 

<td> 

Name or Number 

</td> 

<td> 

<telerik:RadComboBox ID="m_oNameOrNumber2" runat="server" AutoPostBack="true" EnableViewState="true" /> 

</td> 

</tr> 

</table> 

</fieldset> 

</td> 

</tr> 

</table> 

</ContentTemplate> 

</asp:UpdatePanel> 

 

<asp:UpdatePanel runat="server" UpdateMode="Conditional"> 

<ContentTemplate> 

<div> 

<telerik:RadButton ID="m_oSearchBtn" runat="server" Text="Search" OnClick="FindLocations" /> 

</div> 

<div style="float: left; padding: 15px;"> 

<telerik:RadGrid ID="m_oRadGrid" AllowPaging="true" PageSize="3" runat="server" AutoGenerateColumns="False" 

DataSourceID="m_oFoundLocationsSource" HorizontalAlign="NotSet"> 

<MasterTableView DataSourceID="m_oFoundLocationsSource"> 

<Columns> 

<telerik:GridBoundColumn DataField="CustomIdentifier" HeaderText="Custom Identifier" 

DataType="System.String" UniqueName="CustomIdentifier"> 

</telerik:GridBoundColumn> 

</Columns> 

</MasterTableView> 

</telerik:RadGrid> 

</ContentTemplate> 

</asp:UpdatePanel> 

<asp:ObjectDataSource ID="m_oFoundLocationsSource" runat="server" SelectMethod="GetFoundLocations" 

EnablePaging="true" StartRowIndexParameterName="iStartRecord" MaximumRowsParameterName="iMaxRecords" 

SortParameterName="sSortColumns" DataObjectTypeName="PersistenceLayer.Location" 

TypeName="Project1.FindLocation" OldValuesParameterFormatString="original_{0}"></asp:ObjectDataSource> 

</div> 

</asp:Content>

cs file:

using System; 

using System.Collections.Generic; 

using System.Linq;

using System.Web;

using System.Web.UI; 

using System.Web.UI.WebControls; 

using PersistenceLayer; 

using Project1.Helpers; 

using Project1.Cache; 

using System.Collections.ObjectModel; 

using Telerik.Web.UI; 

 

namespace Project1 

{ 

public partial class FindLocation : System.Web.UI.Page 

{ 

#region Event Handlers 

 

#region Page Init 

 

protected void Page_Load(object sender, EventArgs e) 

{ 

if (IsPostBack == false) 

{ 

<font class="Apple-tab-span" style="white-space: pre; "> //initialize drop down content 

} 

 

#endregion 

 

#region Filter Logic 

 

protected void MaintainedByChanged(object sender, EventArgs e) 

{ 

//change dropdown content 

} 

 

protected void CountyChanged(object sender, EventArgs e) 

{ 

//change dropdown content 

} 

 

protected void CityChanged(object sender, EventArgs e) 

{ 

//change dropdown content 

} 

 

protected void FindLocations(object sender, EventArgs e) 

{ 

<font class="Apple-tab-span" style="white-space: pre; "> //get data from drop downs 

ServerSessionCache.FoundLocations = PerformSearch(sCustomId, gOwnedById, gMaintainedById, gCountyId, gCityId); 

m_oRadGrid.Rebind(); 

} 

 

#endregion 

 

#region RadGrid Logic 

 

public static IList<Location> GetFoundLocations(string sSortColumns, int iMaxRecords, int iStartRecord) 

{ 

return ServerSessionCache.FoundLocations; 

} 

 

#endregion 

 

#endregion 

 

#region Methods 

 

public IList<Location> PerformSearch(string sCustomId, Guid gOwnedById, Guid gMaintainedById, Guid gCountyId, Guid gCityId) 

{ 

//use data to perform query, store in oLocations 

 

return oLocations; 

} 

 

#endregion 

} 

}

Duplicate RadGrid

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