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Value of type 'String' cannot be converted to 'Telerik.Web.UI.RadComboBox'.

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ComboBox
This is a migrated thread and some comments may be shown as answers.
Brent
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Brent asked on 03 Feb 2009, 01:03 PM
Hello,

For some reason I cannot get this simple email form to work. The error points to RadComboBox, but I cannot see how to fix it. Please help me, my code is follows:

<%@ Page Language="VB" MasterPageFile="~/oneColumnSlim.master" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="fastquote_Default" title="Untitled Page" %> 
 
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> 
 
<asp:Content ID="Content1" ContentPlaceHolderID="mid" Runat="Server"
    <asp:Panel runat="server" ID="FastQuoteForm">     
                       <asp:Image ID="Image1" runat="server" ImageUrl="http://www.deloosh.com.au/assets/email.png" CssClass="left" />  
                  <h1>Contact Us</h1> 
            <p>We are here to help. If you have a question about our service or your membership,  
                please fill out the form below and click the submit button.</p> 
                 <p>For an instant answer, please make sure you have checked our <href="../faqs/index.php"
                     Frequently asked Questions</a> (FAQs) section.</p> 
                <table style="width:100%;" cellpadding="5px"
                    <tr> 
                        <td align="right">Title </td> 
                             <td> 
                                 <telerik:RadComboBox ID="Title" runat="server"  
                                     ToolTip="Please enter your title" Skin="WebBlue" Text="Title"  
                                     AutoPostBack="True"
                                     <Items> 
                                         <telerik:RadComboBoxItem runat="server" Text="Mr" Value="Mr" /> 
                                         <telerik:RadComboBoxItem runat="server" Text="Mrs" Value="Mrs" /> 
                                         <telerik:RadComboBoxItem runat="server" Text="Miss" Value="Miss" /> 
                                         <telerik:RadComboBoxItem runat="server" Text="Ms" Value="Ms" /> 
                                         <telerik:RadComboBoxItem runat="server" Text="Dr" Value="Dr" ToolTip="Please give your title" /> 
                                         <telerik:RadComboBoxItem runat="server" Text="Prof" Value="Prof" /> 
                                     </Items> 
                                     <CollapseAnimation Duration="200" Type="OutQuint" /> 
                                 </telerik:RadComboBox> 
                                                  <asp:RequiredFieldValidator 
            ID="RequiredFieldValidator1" runat="server" ControlToValidate="Title"  
            ErrorMessage="You need to give your title" 
            ValidationGroup="MessageGroup">            </asp:RequiredFieldValidator>            </td> 
                    </tr> 
                    <tr> 
                        <td align="right">First name </td> 
                        <td> 
                            <telerik:RadTextBox ID="FirstName" runat="server"
                            </telerik:RadTextBox> <asp:RequiredFieldValidator  
            ID="RequiredFieldValidator9" runat="server" ControlToValidate="Message"  
            ErrorMessage="Please enter your message" 
            ValidationGroup="MessageGroup"></asp:RequiredFieldValidator></td
                        
                    </tr> 
                    <tr> 
                        <td align="right">Last name </td> 
                        <td> 
                             <telerik:RadTextBox ID="LastName" Runat="server" Label="" Rows="10"  
                 Skin="Telerik" ToolTip="Enter your last name"  
                                    Width="250px" Wrap="True">             </telerik:RadTextBox> 
              <asp:RequiredFieldValidator  
            ID="RequiredFieldValidator3" runat="server" ControlToValidate="LastName"  
            ErrorMessage="Please enter your last name" 
            ValidationGroup="MessageGroup"></asp:RequiredFieldValidator> 
            </td> 
                    </tr> 
                    <tr> 
                      <td align="right">Company </td> 
                      <td><telerik:RadTextBox ID="Company" runat="server"
                          </telerik:RadTextBox> <asp:RequiredFieldValidator  
            ID="RequiredFieldValidator2" runat="server" ControlToValidate="Company"  
            ErrorMessage="Please enter your company" 
            ValidationGroup="MessageGroup"></asp:RequiredFieldValidator></td
                    </tr> 
                    <tr> 
                      <td align="right">Telephone </td> 
                      <td><telerik:RadTextBox ID="Telephone" runat="server"
                          </telerik:RadTextBox> <asp:RequiredFieldValidator  
            ID="RequiredFieldValidator4" runat="server" ControlToValidate="Telephone"  
            ErrorMessage="Please enter your telephone number" 
            ValidationGroup="MessageGroup"></asp:RequiredFieldValidator></td
                    </tr> 
                    <tr> 
                      <td align="right">Email </td> 
                      <td><telerik:RadTextBox ID="Email" Runat="server" Label="" Skin="Telerik"  
                 ToolTip="Enter your email" Width="190px"</telerik:RadTextBox>  
                  <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"  
                 ErrorMessage="Invalid email address" ControlToValidate="Email"  
                                    ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"  
                                    ValidationGroup="MessageGroup"></asp:RegularExpressionValidator></td
                    </tr> 
                    <tr> 
                      <td align="right">Required Services </td> 
                      <td> 
                          <asp:CheckBoxList ID="Services" runat="server" ToolTip="Choose which services you require"
                              <asp:ListItem>Advanced research design</asp:ListItem> 
                              <asp:ListItem>Survey programming</asp:ListItem> 
                              <asp:ListItem>Survey hosting</asp:ListItem> 
                              <asp:ListItem>Panel respondents</asp:ListItem> 
                              <asp:ListItem>Data analysis</asp:ListItem> 
                          </asp:CheckBoxList> 
                          </td> 
                    </tr> 
                    <tr> 
                      <td align="right">Number of questions </td> 
                      <td><telerik:RadTextBox ID="QuestionNo" runat="server"
                          </telerik:RadTextBox> <asp:RequiredFieldValidator  
            ID="RequiredFieldValidator8" runat="server" ControlToValidate="QuestionNo"  
            ErrorMessage="Please enter the number of questions" 
            ValidationGroup="MessageGroup"></asp:RequiredFieldValidator></td
                    </tr> 
                    <tr> 
                      <td align="right">Number of responses needed </td> 
                      <td><telerik:RadTextBox ID="ResponseNo" runat="server"
                          </telerik:RadTextBox> <asp:RequiredFieldValidator  
            ID="RequiredFieldValidator5" runat="server" ControlToValidate="ResponseNo"  
            ErrorMessage="Please enter the number of responses" 
            ValidationGroup="MessageGroup"></asp:RequiredFieldValidator></td
                    </tr> 
                    <tr> 
                      <td align="right">Target demographic </td> 
                      <td><telerik:RadTextBox ID="Demographic" runat="server"
                          </telerik:RadTextBox>   
            </td> 
                    </tr> 
                    <tr> 
                      <td align="right">Other information </td> 
                      <td><telerik:RadTextBox ID="OtherInfo" runat="server" TextMode="MultiLine"
                          </telerik:RadTextBox> </td> 
                    </tr> 
                    <tr> 
                      <td align="right">&nbsp;</td> 
                      <td><telerik:RadTextBox ID="Promo" runat="server"
                          </telerik:RadTextBox> </td> 
                    </tr> 
                    <tr> 
                      <td align="right">&nbsp;</td> 
                      <td>&nbsp;</td> 
                    </tr> 
                    <tr> 
                      <td align="right">&nbsp;</td> 
                      <td>&nbsp;</td> 
                    </tr> 
                    <tr> 
                      <td align="right">&nbsp;</td> 
                      <td>&nbsp;</td> 
                    </tr> 
                    <tr> 
                      <td align="right">&nbsp;</td> 
                      <td>&nbsp;</td> 
                    </tr> 
                    <tr> 
                      <td align="right">&nbsp;</td> 
                      <td>&nbsp;</td> 
                    </tr> 
                    <tr> 
                      <td align="right">&nbsp;</td> 
                      <td>&nbsp;</td> 
                    </tr> 
                </table> 
                  
            <br /> 
             <br /> 
             
<asp:ImageButton  
            ID="SendEmail" runat="server" ImageUrl="http://www.deloosh.com.au/assets/red-button-send.jpg" CausesValidation="true" ValidationGroup="MessageGroup" CssClass="rightButton" /> 
              </asp:Panel> 
     
<asp:Panel runat="server" ID="FastQuoteSentForm"
        Your feedback has been sent. If needed, we will respond as soon as we can. Thank  
        you for your interest in AussieThink. 
    </asp:Panel> 
<div class="privacy">  
        <asp:Image ID="Image2" runat="server" ImageUrl="http://www.deloosh.com.au/assets/mail.png" /> 
            style=&quot;width: 63px; height: 41px&quot; /&gt;Corporate: Suite 5, Manchester Lane,  
        Parkville, VIC 3052  
    </div> 
 
 
</asp:Content> 
 
 






aspx.vb file:

Imports System.Net.Mail 
Imports System.Net 
 
Partial Class fastquote_Default 
    Inherits System.Web.UI.Page 
 
    Protected Sub SendEmail_Click(ByVal sender As ObjectByVal e As System.Web.UI.ImageClickEventArgs) Handles SendEmail.Click 
        '!!! UPDATE THIS VALUE TO YOUR EMAIL ADDRESS 
        Const ToAddress As String = "brent.coker@gmail.com" 
 
        '(1) Create the MailMessage instance 
        Dim mm As New MailMessage(Email.Text, ToAddress) 
 
        '(2) Assign the MailMessage's properties 
        mm.Subject = Services.Text 
        mm.IsBodyHtml = True 
        mm.Body = _ 
"<html><head><title>" & _ 
HttpUtility.HtmlEncode(Title.Text) & _ 
"</title></head><body>" & _ 
"<p>" & _ 
HttpUtility.HtmlEncode(FirstName.Text) & "</p>" & _ 
"<p>Employee of the month: " & _ 
HttpUtility.HtmlEncode(LastName.Text) & "</p>" & _ 
"<p>This month's featured event: " & _ 
HttpUtility.HtmlEncode(Company.Text) & "</p>" & _ 
"<p>" & _ 
HttpUtility.HtmlEncode(Telephone.Text) & "</p>" & _ 
"<p>Employee of the month: " & _ 
HttpUtility.HtmlEncode(Email.Text) & "</p>" & _ 
"<p>This month's featured event: " & _ 
HttpUtility.HtmlEncode(Company.Text) & "</p>" & _ 
"<p>" & _ 
HttpUtility.HtmlEncode(Services.Text) & "</p>" & _ 
"<p>Employee of the month: " & _ 
HttpUtility.HtmlEncode(QuestionNo.Text) & "</p>" & _ 
"<p>This month's featured event: " & _ 
HttpUtility.HtmlEncode(ResponseNo.Text) & "</p>" & _ 
"<p>" & _ 
HttpUtility.HtmlEncode(Demographic.Text) & "</p>" & _ 
"<p>Employee of the month: " & _ 
HttpUtility.HtmlEncode(OtherInfo.Text) & "</p>" & _ 
"<p>This month's featured event: " & _ 
HttpUtility.HtmlEncode(Promo.Text) & "</p>" & _ 
"</body></html>" 
 
        '(3) Create the SmtpClient object 
        Dim smtp As New SmtpClient 
 
        '(4) Send the MailMessage (will use the Web.config settings) 
        smtp.Send(mm) 
 
        'Show the EmailSentForm Panel and hide the EmailForm Panel 
        FastQuoteSentForm.Visible = True 
        FastQuoteForm.Visible = False 
    End Sub 
 
    Protected Sub Page_Load(ByVal sender As ObjectByVal e As System.EventArgs) Handles Me.Load 
        If Not Page.IsPostBack Then 
            'On the first page load, hide the EmailSentForm Panel 
            FastQuoteSentForm.Visible = False 
        End If 
    End Sub 
 
 
End Class 
 

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ComboBox
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Brent
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