When session value changes error occuring

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VB

ASP.NET

SQL-Server

Hi,
i'm created a radgrid which displays employee details. when i'm trying to insert a new employee, the radgrid edit form opens. in that, i'm using two radcombobox named cmb_company and cmb_commercialActivity and seperate sqldatasource for each.

<div class="art-layout-cell layout-item-1" style="width: 100%;">
	<div class="art-layout-cell layout-item-4" style="width: 30%;">
		<asp:Label ID="label_SelectCompany" AssociatedControlID="cmb_company" runat="server" Text="Company Name:" />
	</div>
	<div class="art-layout-cell layout-item-4" style="width: 60%;">
		<telerik:RadComboBox  runat="server" ID="cmb_company" Height="250" AppendDataBoundItems="True" CausesValidation="False" CollapseDelay="10" SelectedValue='<%# Bind("CompanyID") %>' 
			DataMember="DefaultView" AutoPostBack="true" ExpandDelay="0" ItemRequestTimeout="0" Width="80%" MarkFirstMatch="True" EmptyMessage="- Select Company -"
			DataSourceID="SqlDataSource_Company" DataTextField="CompanyName" DataValueField="ID"  önSelectedIndexChanged="cmb_company_SelectedIndexChanged" />
		<asp:RequiredFieldValidator ID="CompanyRequired" runat="server" ControlToValidate="cmb_company" ErrorMessage="*" ForeColor="Red" ValidationGroup="CompanyGroup" />
	</div>
</div>  <%-- cmb_company --%>
<div class="art-layout-cell layout-item-1" style="width: 100%;">
	<div class="art-layout-cell layout-item-4" style="width: 30%;">
		<asp:Label ID="label_CommercialActivity" AssociatedControlID="cmb_commercialActivity" runat="server" Text="Commercail Activity:" />
	</div>
	<div class="art-layout-cell layout-item-4" style="width: 60%;">
		<telerik:RadComboBox  runat="server" ID="cmb_commercialActivity" AppendDataBoundItems="True" CausesValidation="False" CollapseDelay="10" DataMember="DefaultView"
			ExpandDelay="0" ItemRequestTimeout="0" Width="80%" MarkFirstMatch="True" EmptyMessage="- Select Commercial Activity -" SelectedValue='<%# Bind("EmployeeCommercialActivityID") %>' 
			DataSourceID="SqlDataSource_CommercialActivity" DataTextField="CommercialActivityEnglishName" DataValueField="ID" />
		<%--<asp:RequiredFieldValidator ID="CommercialActivityRequired" runat="server" ControlToValidate="cmb_commercialActivity" ErrorMessage="*" ForeColor="Red" ValidationGroup="CompanyGroup" />--%>
	</div>
</div>  <%-- cmb_commercialActivity  --%>

and sqldatasource

<asp:SqlDataSource ID="SqlDataSource_CommercialActivity" runat="server" ConnectionString="<%$ ConnectionStrings:HRSystemDataBaseConnection %>" SelectCommand="SELECT APP_CompaniesCommercialActivities.ID, APP_CommercialActivities.CommercialActivityEnglishName FROM APP_CompaniesCommercialActivities INNER JOIN APP_CommercialActivities ON APP_CompaniesCommercialActivities.CommercialActivityID = APP_CommercialActivities.ID WHERE (APP_CompaniesCommercialActivities.CompanyID = @CompanyID) ORDER BY APP_CommercialActivities.CommercialActivityEnglishName">
	<SelectParameters>
		<asp:SessionParameter Name="CompanyID" SessionField="CompanyID" />
	</SelectParameters>
</asp:SqlDataSource>
								  
<asp:SqlDataSource ID="SqlDataSource_Company" runat="server" ConnectionString="<%$ ConnectionStrings:HRSystemDataBaseConnection %>" 
	SelectCommand="SELECT ID, CompanyName FROM APP_Companies ORDER BY CompanyName" />

and codebehind is

protected void cmb_company_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)
{
	Session["CompanyID"] = e.Value;
}

when i change the company, the session value is changed, and error is reporting
"Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control."
at cmb_commercialActivity.



Regards,
rafsan