Display only current and future items from SQL table to grid

SelectCommand="SELECT [ID], [Subject], [Start], [End], [RecurrenceRule], [RecurrenceParentID] FROM [AppointmentsWithLongSubjects] WHERE ([Start] >= @Start)"
 
 <SelectParameters>
                        <asp:Parameter DbType="DateTime" DefaultValue="<%=DateTime.Today.Date.AddDays(60)%>" Name="Start" />
                    </SelectParameters>

                                              

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Here is the entire code:
 
------------------------------------------------------------------------
ASPX
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<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="eventsCalendar.aspx.cs" validateRequest="false" Inherits="eventsCalendar" Title="Untitled Page" %>
 
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
    </telerik:RadScriptManager>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:jointCouncilConnectionString %>"
        SelectCommand="SELECT [ID], [Subject], [Start], [End], [RecurrenceRule], [RecurrenceParentID] FROM [AppointmentsWithLongSubjects]" DeleteCommand="DELETE FROM [AppointmentsWithLongSubjects] WHERE [ID] = @ID" InsertCommand="INSERT INTO [AppointmentsWithLongSubjects] ([Subject], [Start], [End], [RecurrenceRule], [RecurrenceParentID]) VALUES (@Subject, @Start, @End, @RecurrenceRule, @RecurrenceParentID)" UpdateCommand="UPDATE [AppointmentsWithLongSubjects] SET [Subject] = @Subject, [Start] = @Start, [End] = @End, [RecurrenceRule] = @RecurrenceRule, [RecurrenceParentID] = @RecurrenceParentID WHERE [ID] = @ID">
        <DeleteParameters>
            <asp:Parameter Name="ID" Type="Int32" />
        </DeleteParameters>
        <UpdateParameters>
            <asp:Parameter Name="Subject" Type="String" />
            <asp:Parameter DbType="DateTime" Name="Start" />
            <asp:Parameter DbType="DateTime" Name="End" />
            <asp:Parameter Name="RecurrenceRule" Type="String" />
            <asp:Parameter Name="RecurrenceParentID" Type="String" />
            <asp:Parameter Name="ID" Type="Int32" />
        </UpdateParameters>
        <InsertParameters>
            <asp:Parameter Name="Subject" Type="String" />
            <asp:Parameter DbType="DateTime" Name="Start" />
            <asp:Parameter DbType="DateTime" Name="End" />
            <asp:Parameter Name="RecurrenceRule" Type="String" />
            <asp:Parameter Name="RecurrenceParentID" Type="String" />
        </InsertParameters>
    </asp:SqlDataSource>
    <asp:Label ID="Label1" runat="server" Style="font-size: large; color: threeddarkshadow;
        font-family: Arial" Text="Calendar of Events"></asp:Label><br />
    <table cellpadding="5" style="width: 100%">
        <tr>
            <td style="width: 65%">
            </td>
            <td style="width: 35%">
            </td>
        </tr>
        <tr>
            <td valign="top">
    <telerik:RadScheduler ID="RadScheduler1" runat="server" DataEndField="End" DataKeyField="ID"
        DataRecurrenceField="RecurrenceRule" DataRecurrenceParentKeyField="RecurrenceParentID"
        DataSourceID="SqlDataSource1" DataStartField="Start" DataSubjectField="Subject"
        HoursPanelTimeFormat="htt" Skin="Outlook" ValidationGroup="RadScheduler1" FirstDayOfWeek="Monday" LastDayOfWeek="Sunday" OverflowBehavior="Expand" RowHeight="20px" SelectedView="MonthView">
        <Localization AdvancedAllDayEvent="All day" />
        <AdvancedForm DateFormat="MM/dd/yyyy" TimeFormat="h:mm tt" />
    </telerik:RadScheduler>
            </td>
            <td valign="top">
                <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:jointCouncilConnectionString %>"
                    DeleteCommand="DELETE FROM [AppointmentsWithLongSubjects] WHERE [ID] = @ID" InsertCommand="INSERT INTO [AppointmentsWithLongSubjects] ([Subject], [Start], [End], [RecurrenceRule], [RecurrenceParentID]) VALUES (@Subject, @Start, @End, @RecurrenceRule, @RecurrenceParentID)"
                    SelectCommand="SELECT [ID], [Subject], [Start], [End], [RecurrenceRule], [RecurrenceParentID] FROM [AppointmentsWithLongSubjects] WHERE ([Start] >= @Start)"
                    UpdateCommand="UPDATE [AppointmentsWithLongSubjects] SET [Subject] = @Subject, [Start] = @Start, [End] = @End, [RecurrenceRule] = @RecurrenceRule, [RecurrenceParentID] = @RecurrenceParentID WHERE [ID] = @ID" >
                    <DeleteParameters>
                        <asp:Parameter Name="ID" Type="Int32" />
                    </DeleteParameters>
                    <UpdateParameters>
                        <asp:Parameter Name="Subject" Type="String" />
                        <asp:Parameter DbType="DateTime" Name="Start" />
                        <asp:Parameter DbType="DateTime" Name="End" />
                        <asp:Parameter Name="RecurrenceRule" Type="String" />
                        <asp:Parameter Name="RecurrenceParentID" Type="String" />
                        <asp:Parameter Name="ID" Type="Int32" />
                    </UpdateParameters>
                    <InsertParameters>
                        <asp:Parameter Name="Subject" Type="String" />
                        <asp:Parameter DbType="DateTime" Name="Start" />
                        <asp:Parameter DbType="DateTime" Name="End" />
                        <asp:Parameter Name="RecurrenceRule" Type="String" />
                        <asp:Parameter Name="RecurrenceParentID" Type="String" />
                    </InsertParameters>
                    <SelectParameters>
                        <asp:Parameter DbType="DateTime" DefaultValue="<%=DateTime.Today.Date.AddDays(60)%>" Name="Start" />
                    </SelectParameters>
                </asp:SqlDataSource>
                <telerik:RadGrid ID="RadGrid1" runat="server" AllowAutomaticUpdates="True" DataSourceID="SqlDataSource2"
                    GridLines="None">
                    <MasterTableView AutoGenerateColumns="False" CommandItemDisplay="Top" DataKeyNames="ID"
                        DataSourceID="SqlDataSource2">
                        <Columns>
                            <telerik:GridBoundColumn DataField="ID" DataType="System.Int32" HeaderText="ID" ReadOnly="True"
                                SortExpression="ID" UniqueName="ID" Visible="False">
                            </telerik:GridBoundColumn>
                            <telerik:GridTemplateColumn DataField="Subject" HeaderText="Upcoming Events" SortExpression="Subject"
                                UniqueName="Subject">
                                <EditItemTemplate>
                                    <asp:TextBox ID="SubjectTextBox" runat="server" Text='<%# Bind("Subject") %>'></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:Label ID="Label2" runat="server" Style="font-size: x-small; color: gray" Text='<%# Eval("Start", "{0:g}") %>'></asp:Label>
                                    <br />
                                    <asp:Label ID="SubjectLabel" runat="server" Text='<%# Eval("Subject") %>'></asp:Label>
                                </ItemTemplate>
                            </telerik:GridTemplateColumn>
                            <telerik:GridTemplateColumn DataField="Start" DataType="System.DateTime" HeaderText="Start"
                                SortExpression="Start" UniqueName="Start" Visible="False">
                                <EditItemTemplate>
                                    <asp:TextBox ID="StartTextBox" runat="server" Text='<%# Bind("Start") %>'></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:Label ID="StartLabel" runat="server" Text='<%# Eval("Start", "{0:d}") %>'></asp:Label>
                                </ItemTemplate>
                            </telerik:GridTemplateColumn>
                            <telerik:GridTemplateColumn DataField="End" DataType="System.DateTime" HeaderText="End"
                                SortExpression="End" UniqueName="End" Visible="False">
                                <EditItemTemplate>
                                    <asp:TextBox ID="EndTextBox" runat="server" Text='<%# Bind("End") %>'></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:Label ID="EndLabel" runat="server" Text='<%# Eval("End", "{0:d}") %>'></asp:Label>
                                </ItemTemplate>
                            </telerik:GridTemplateColumn>
                            <telerik:GridBoundColumn DataField="RecurrenceRule" HeaderText="RecurrenceRule" SortExpression="RecurrenceRule"
                                UniqueName="RecurrenceRule" Visible="False">
                            </telerik:GridBoundColumn>
                            <telerik:GridBoundColumn DataField="RecurrenceParentID" HeaderText="RecurrenceParentID"
                                SortExpression="RecurrenceParentID" UniqueName="RecurrenceParentID" Visible="False">
                            </telerik:GridBoundColumn>
                        </Columns>
                    </MasterTableView>
                </telerik:RadGrid></td>
        </tr>
        <tr>
            <td>
            </td>
            <td>
            </td>
        </tr>
    </table>
    <br />
    &nbsp;&nbsp;
</asp:Content>
 
------------------------------------------------------------------------
Code Behind:
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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
 
public partial class eventsCalendar : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
 
}
                                              

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The variable name '@Start' has already been declared. Variable names must be unique within a query batch or stored procedure.
 
Source Error: 
 
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. 
 
Stack Trace: 
 
[SqlException (0x80131904): The variable name '@Start' has already been declared. Variable names must be unique within a query batch or stored procedure.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +1950890
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +4846875
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +194
   System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2392
   System.Data.SqlClient.SqlDataReader.ConsumeMetaData() +33
   System.Data.SqlClient.SqlDataReader.get_MetaData() +83
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +297
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +954
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +162
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +32
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +141
   System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +12
   System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) +10
   System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +130
   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +287
   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +92
   System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +1297
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +19
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +142
   Telerik.Web.UI.GridTableView.PerformSelect() +28
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +73
   Telerik.Web.UI.GridTableView.DataBind() +365
   Telerik.Web.UI.RadGrid.DataBind() +165
   Telerik.Web.UI.RadGrid.AutoDataBind(GridRebindReason rebindReason) +3849
   Telerik.Web.UI.RadGrid.Rebind() +34
   Telerik.Web.UI.GridCommandEventArgs.ExecuteCommand(Object source) +5685
   Telerik.Web.UI.RadGrid.OnBubbleEvent(Object source, EventArgs e) +191
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   Telerik.Web.UI.GridItem.OnBubbleEvent(Object source, EventArgs e) +61
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   Telerik.Web.UI.GridItem.OnBubbleEvent(Object source, EventArgs e) +165
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e) +118
   System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +135
   System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +175
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565
 
 
                                              

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