Data Input Problem

In Visual Web Developer I
have created a data input form based on the documentation I found in the .NET
Framework Class Library (SqlDataSource.InsertCommand Property).
  Originally my form contained 4 textboxes
(FirstName, LastName, Phone, Email) and worked fine.
  All this data is nvarchar string data. 


When I added a checkbox I
get an error that “String
was not recognized as a valid Boolean�
 
when the checkbox is checked.
 
When the checkbox is unchecked the data is input without a problem.
  This is a bit data field in the table.
 






Here is my VB code, Insert
Parameters for my SqlDataSource1, and button code:
 


<script
runat="server">



    Private Sub InsertData(ByVal
Source As Object,
ByVal e As
EventArgs)



        SqlDataSource1.Insert()



    End Sub
    


</script>




<InsertParameters>



                <asp:formParameter Name="FirstName" Type="String" FormField="txtFirstName"/>



                <asp:formParameter Name="LastName" Type="String" FormField="txtLastName"/>



                <asp:formParameter Name="Phone" Type="String" FormField="txtPhone"/>



                <asp:formParameter Name="Email" Type="String" FormField="txtEmail"/>



                <asp:formParameter Name="FreeInfo" Type="Boolean" FormField="checkbox1"/>


</InsertParameters>






<asp:Button id="Button1" runat="server" text="Submit" OnClick="insertdata"/>




I suspect that the problem
is with the VB code which will only accept string input data, but don’t know
how to fix it.
 Any thoughts on how to
fix this problem?
  Thanks in advance for
any help provided.