DetailsView validation fields

I create a detailsview to insert data in a table but I don't know how to validate each field that is typed in the page before sending the information to the database.
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post your insert parameters

the insert parameters will now need to be in the form of

<asp:ControlParameter ControlID="detailsViewID$textBoxID" Name="eventTitle" />

for all of them, replace the two IDs with the actual controls IDs, do that for all of them  dvID$controlID
convert the boundfields to template fields and add validators

instead of
<asp:BoundField DataField="eventTitle" HeaderText="Title" SortExpression="eventTitle" HtmlEncode="false" />

                                          <asp:TemplateField HeaderText="Title">
                                                      <%# Eval("eventTitle") %>
                                                      <asp:RequiredFieldValidator ControlToValidate="txtEventTitle" ID="RequiredFieldValidator1" runat="server" Text="You must enter a title<br>"></asp:RequiredFieldValidator>
                                                      <asp:TextBox ID="txtEventTitle" MaxLength="50" runat="server" Text='<%# Eval("eventTitle") %>'></asp:TextBox>
and for the parameters
                  <asp:ControlParameter ControlID="dvEventDetails$txtEventTitle" Name="eventTitle" />
CarolinatAuthor Commented:
Thanks, It worked but the insert link doesn't do anything. What code do I have to add?
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Do you have an insert command and insert parameters on your SqlDataSource?  When you say doesn't do anything, do you mean the page doesn't change, or that no form is displayed?  Is there a JavaScript error?
CarolinatAuthor Commented:
I'm using a Detailsview to create an insert form. Now, I can validate some fields that can't be nulls but when I fill out all of the fields and then click in Insert link it showed me a page with the following error and I don't know why the insert doesn't take the values I'm typing in the form.

Cannot insert the value NULL into column 'BoxNum', table 'Venus.dbo.Boxes'; column does not allow nulls. INSERT fails.
The statement has been terminated.
CarolinatAuthor Commented:
I have this

                <asp:Parameter Name="BoxNum" Type="Int64" />
                <asp:Parameter Name="Status" Type="String" />
                <asp:Parameter Name="DateClose" Type="DateTime" />
                <asp:Parameter Name="DateOpen" Type="DateTime" />
                <asp:Parameter Name="User" Type="String" DefaultValue="CAROLINA" />
but still shows me the same error.
CarolinatAuthor Commented:
What should I write in--> Name="eventTitle" ?
CarolinatAuthor Commented:
Thanks, it works perfect.
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