In a formview I have few textbox, label, and two dropdownlist. On one of the dropdownlist, its calling a method to display data from the database. Its working fine. But I am trying to add a text in the dropdownlist like " Please select a value". I tried a databinding. But got the following error. 

  Compiler Error Message: CS0103: The name 'ddlmobProvider' does not exist in the current context.

Can anybody help me with this please?  

aspx file:

<asp:FormView ID="FormView1" runat="server" DataSourceID="odsProfile" DefaultMode="Edit" CellPadding="2" ForeColor="White" Width="84%" BorderStyle="None" CellSpacing="2" >        
        <EditItemTemplate>
        <table style="width: 100%" onmouseover="RegisterHighlighterEvents(this, false, false);" >
            <tr ><td ><b>User Name:</b></td><td ><asp:TextBox ID="UserName" Text='<%# Bind("UserName") %>' ReadOnly="true" runat="server" width="250px"/></td></tr>
            <tr><td ><b>First Name:</b></td><td ><asp:TextBox runat="server" ID="FirstName" Text='<%# Bind("FirstName") %>'  Width="250px"/></td></tr>            
            <tr><td ><b>Last Name:</b></td><td ><asp:TextBox runat="server" ID="LastName" Text='<%# Bind("LastName") %>'  Width="250px"/></td></tr> 
            <tr><td ><b>Company:</b></td><td><asp:TextBox runat="server" ID="TextCompany" Value='<%# Eval("Company") %>' ReadOnly="true" /></td></tr>           
           
            <asp:HiddenField ID="Company" runat="server" Value='<%# Bind("CompanyID") %>' />
            <tr><td ><b>E-mail:</b></td><td ><asp:TextBox runat="server" ID="Make" Text='<%# Bind("Email") %>'  Width="250px"/></td></tr>
                                     
           <tr><td><b>Time Zone: </b></td><td><asp:DropDownList ID="ddltimezone"  OnLoad="ddltimezone_OnLoad" 
           DataSourceID="timezone" DataValueField="TimeZoneID" DataTextField="TimeName" runat="server" 
           Width="250px" SelectedValue='<%# Bind("TimeZoneID") %>' ></asp:DropDownList><br />
 

 	<tr><td ><b>Mobile Number:</b></td><td ><asp:TextBox runat="server" ID="TextBox1" Text=""  Width="250px"/></td></tr>
           <tr><td ><b>Mobile Provider:</b></td><td><asp:DropDownList ID="ddlmobProvider" OnDataBinding="ddlmobProvider_DataBinding"
           DataSourceID="mobileProvider" DataValueField="MobilePhoneProviderID" DataTextField="ProviderName" runat="server" 
           Width="250px" ></asp:DropDownList><br />

 <asp:ObjectDataSource ID="timezone" runat="server" SelectMethod="GetTimeZoneList"  TypeName="CommonDB"></asp:ObjectDataSource>
   <asp:ObjectDataSource ID="mobileProvider" runat="server" SelectMethod="GetMobileProviderList" TypeName="CommonDB"   ></asp:ObjectDataSource>

    <br /> 

Behind the code:

 protected void ddlmobProvider_DataBinding(object sender, EventArgs e)
    {
        ddlmobProvider.Items.Add(new DataList("Please select a Provider", "-1"));
    }

Don't do that. Instead, just defin your ListItem declaratively within your control and set the AppendDataBoundItems property to True. 

<asp:dropdownlist id="ddlmobProvider" runat="server" appenddatabounditems="true"
	datasourceid="mobileProvider" datatextfield="ProviderName" datavaluefield="MobilePhoneProviderID"
	width="250px">
	<asp:listitem text="Please select a Provider" value="-1" />
</asp:dropdownlist>

 Wonderful. Thanks a lot. Its working....