Required Field Validators disappear in an update panel - asp.net

Question

I have an Update Panel which contains a GridView. 3 TextBoxes and a DropDownList control are Validated. I also have 3 different DDLs and 3 Checkbox controls in the panel that each trigger a rebind of the Gridview. When one of the un-validated DDLs or Checkboxes is changed they all fire the same changed event and I lose all of the Validation on the TextBoxes and the 1 DDL.
I'm a bit confused as to whether I should be setting Initial values on the validated or un-validated controls, if I should "group" the validation, and which set of controls needs to have the CausesValidation flag set. I hate to spam with massive amounts of code, but considering how much there is in this update panel....
<asp:UpdatePanel ID="UpdatePanel_Search" runat="server" >
<ContentTemplate>
<table class="auto-style2">
<tr>
<td>
<table class="auto-style1">
<tr>
<td class="auto-style3">
<div>
<table class="auto-style1" border="1px" frame="void">
<tr>
<td bgcolor="#00198D" style="text-align: center" class="auto-style19">
<asp:Label ID="FilterLabel3" runat="server" ForeColor="White" Text="Used by OEM"></asp:Label>
</td>
<td bgcolor="#00198D" style="text-align: center" class="auto-style9">
<asp:Label ID="FilterLabel4" runat="server" ForeColor="White" Text="Item Type"></asp:Label>
</td>
<td bgcolor="#00198D" style="text-align: center" class="auto-style24">
<asp:Label ID="FilterLabel5" runat="server" ForeColor="White" Text="Group Type"></asp:Label>
</td>
<td bgcolor="#00198D" style="text-align: center" class="auto-style12">
<asp:Label ID="FilterLabel6" runat="server" ForeColor="White" Text="Part Active"></asp:Label>
</td>
<td bgcolor="#00198D" style="text-align: center" class="auto-style17">
<asp:Label ID="FilterLabel7" runat="server" ForeColor="White" Text="Non-Inventory Part"></asp:Label>
</td>
<td bgcolor="#00198D" style="text-align: center" class="auto-style7">
<asp:Label ID="FilterLabel8" runat="server" ForeColor="White" Text="Part In Stock"></asp:Label>
</td>
</tr>
<tr>
<td class="auto-style19">
<asp:DropDownList ID="DDL_OEM" runat="server" Height="27px" Width="150px" AutoPostBack="True" AppendDataBoundItems="True" OnSelectedIndexChanged="Filter_DataSet" ></asp:DropDownList>
</td>
<td class="auto-style9">
<asp:DropDownList ID="DDL_ItemTypes" runat="server" Height="27px" Width="150px" AutoPostBack="True" AppendDataBoundItems="True" OnSelectedIndexChanged="Filter_DataSet" ></asp:DropDownList>
</td>
<td class="auto-style9">
<asp:DropDownList ID="DDL_GroupTypes" runat="server" Height="27px" Width="150px" AutoPostBack="True" AppendDataBoundItems="True" OnSelectedIndexChanged="Filter_DataSet" ></asp:DropDownList>
</td>
<td class="auto-style12">
<asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" OnCheckedChanged="Filter_DataSet" Checked="True" Style="text-align: center" />
</td>
<td class="auto-style17">
<asp:CheckBox ID="CheckBox2" runat="server" AutoPostBack="True" OnCheckedChanged="Filter_DataSet" Style="text-align: center" />
</td>
<td class="auto-style7">
<asp:CheckBox ID="CheckBox3" runat="server" AutoPostBack="True" OnCheckedChanged="Filter_DataSet" Style="text-align: center" />
</td>
</tr>
</table>
<div>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"
ControlToValidate="TextBox_Ticket_Search"
ErrorMessage="Ticket Number is Required. Enter NOTICKET if the item you are requesting is for your tech stock(i.e. a tool, USB drive, etc.)"
ForeColor="Red">
</asp:RequiredFieldValidator>
</div>
<div>
<asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"
ControlToValidate="TextBox_Part_Search"
ErrorMessage="Part Number is Required. Select a Part from the Catalog before submitting a request."
ForeColor="Red">
</asp:RequiredFieldValidator>
</div>
<div>
<asp:RequiredFieldValidator ID="RequiredFieldValidator6" runat="server"
ControlToValidate="TextBox_Serial_Search"
ErrorMessage="System Serial Number is Required. Enter NOSERIAL if the item you are requesting is for your tech stock(i.e. a tool, USB drive, etc.)"
ForeColor="Red">
</asp:RequiredFieldValidator>
</div>
<div>
<asp:RequiredFieldValidator ID="RequiredFieldValidator11" runat="server"
ControlToValidate="DDL_OEM_submit0"
ErrorMessage="System Model is a required field. Please select a Model from the Drop Down below."
InitialValue="0"
ForeColor="Red">
</asp:RequiredFieldValidator>
</div>
</td>
</tr>
<table class="auto-style1">
<tr>
<td class="auto-style34">
<table class="auto-style1">
<tr>
<td>
<asp:Label ID="Label_Comments_Search" runat="server" Text="Comments:"></asp:Label>
</td>
</tr>
<tr>
<td style="text-align: left">
<asp:TextBox runat="server"
ID="TextBox_Comments_Search"
TextMode="multiline"
TextWrapping="Wrap"
AcceptsReturn="True"
VerticalScrollBarVisibility="Visible" Height="100px" Width="300px">
</asp:TextBox>
</td>
</tr>
</table>
</td>
<td class="auto-style29">
<table class="auto-style1">
<tr>
<td class="auto-style4">
<asp:Label ID="Label_Ticket_Search" runat="server" Text="Ticket #:"></asp:Label>
</td>
<td class="auto-style32">
<asp:TextBox ID="TextBox_Ticket_Search" runat="server"></asp:TextBox>
<span class="auto-style23">*</span></td>
</td>
</tr>
<tr>
<td style="text-align: right">
<asp:Label ID="Label_Part_Search" runat="server" Text="Part #:"></asp:Label>
</td>
<td class="auto-style32">
<asp:TextBox ID="TextBox_Part_Search" runat="server" ReadOnly="true" BackColor="#CCCCCC"></asp:TextBox>
<span class="auto-style23">*</span>
</td>
</tr>
<tr>
<td style="text-align: right" class="auto-style21">
<asp:Label ID="Label12" runat="server" Text="Serial #:"></asp:Label></td>
<td class="auto-style32">
<asp:TextBox ID="TextBox_Serial_Search" runat="server"></asp:TextBox>
<span class="auto-style23">*</span></td>
</tr>
<tr>
<td style="text-align: right" class="auto-style21">
<asp:Label ID="Label_Damage_Search" runat="server" Text="Part Damaged:"></asp:Label>
</td>
<td style="text-align: left" class="auto-style31">
<asp:CheckBox ID="CheckBox_Damage_Search" runat="server"></asp:CheckBox>
</td>
</tr>
</table>
</td>
<td>
<table class="auto-style25">
<tr>
<td>
<table class="auto-style25">
<tr>
<td>
<asp:Label ID="Label15" runat="server" Style="text-align: left" Text="Model:"></asp:Label>
</td>
<td align="left">
<asp:DropDownList ID="DDL_OEM_submit0" runat="server">
</asp:DropDownList>
<span class="auto-style23">*</span>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td>
<asp:Button ID="Button2" runat="server" Text="Submit Part Request" OnClick="Button2_Click" />
</td>
</tr>
</table>
</td>
<table class="auto-style1">
<tr>
<td>
<table class="auto-style1">
<tr>
<td class="auto-style8" valign="top">
<asp:GridView ID="GridView1"
runat="server"
AutoGenerateColumns="False"
DataKeyNames="ID"
DataSourceID="SqlDataSource1"
EnableModelValidation="True"
AllowSorting="True"
OnSelectedIndexChanged="Gridview1_SelectedIndexChanged"
AutoGenerateSelectButton="True"
BackColor="White"
BorderColor="#999999"
BorderStyle="None"
BorderWidth="1px"
CellPadding="3"
GridLines="Vertical" HorizontalAlign="Justify">
<FooterStyle BackColor="#CCCCCC" ForeColor="Black" />
<HeaderStyle BackColor="#00198D" ForeColor="White" />
<PagerStyle ForeColor="Black" BackColor="#999999" HorizontalAlign="Center" />
<AlternatingRowStyle BackColor="#DCDCDC" />
<EmptyDataTemplate>
No records could be retrieved from the database. We apologize for the inconvenience.
</EmptyDataTemplate>
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
<asp:BoundField DataField="OEMPartCode" HeaderText="OEMPartCode" SortExpression="OEMPartCode" />
<asp:BoundField DataField="OEM" HeaderText="OEM" InsertVisible="False" ReadOnly="True" SortExpression="OEM" />
<asp:BoundField DataField="Sub Categories" HeaderText="Models" InsertVisible="False" ReadOnly="True" SortExpression="Sub Categories" />
</Columns>
<RowStyle BackColor="#EEEEEE" ForeColor="Black" />
<SelectedRowStyle BackColor="Red" Font-Bold="True" ForeColor="White" />
</asp:GridView>
</td>
<td style="text-align: left" valign="top">
<asp:DetailsView
ID="DetailsView1"
runat="server"
DataSourceID="SqlDataSource2"
Height="50px"
Width="556px"
CellPadding="4"
AutoGenerateRows="False"
OnDataBound="DetailsView1_OnDataBound"
ForeColor="White"
EnableModelValidation="True"
DataKeyNames="ID"
HorizontalAlign="Left"
Style="margin-right: 0px">
<FieldHeaderStyle BackColor="#00198D" Font-Bold="True" ForeColor="White" />
<Fields>
<asp:BoundField DataField="ID" HeaderText="ID" />
<asp:BoundField DataField="OEMPartCode" HeaderText="OEMPartCode" />
<asp:BoundField DataField="PartCode2" HeaderText="PartCode2" />
<asp:TemplateField HeaderText="UsedByOEM">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("UsedByOEM") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="ItemType">
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("JoinedItemType") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="GroupType">
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("JoinedGroupType") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="PartDesc" HeaderText="PartDescription" SortExpression="PartDesc" />
<asp:BoundField DataField="PartComment" HeaderText="PartComment" SortExpression="PartComment" />
<asp:BoundField DataField="PartCount" HeaderText="PartCount" SortExpression="PartCount" />
<asp:BoundField DataField="PartMin" HeaderText="PartMin" SortExpression="PartMin" />
<asp:CheckBoxField DataField="PartActive" HeaderText="PartActive" SortExpression="PartActive" />
<asp:BoundField DataField="MFRPartNumber" HeaderText="MFRPartNumber" SortExpression="MFRPartNumber" />
<asp:BoundField DataField="PartCapacity" HeaderText="PartCapacity" SortExpression="PartCapacity" />
<asp:CheckBoxField DataField="PreTurnRequired" HeaderText="PreTurnRequired" SortExpression="PreTurnRequired" />
<asp:TemplateField HeaderText="AssemblyPart">
<ItemTemplate>
<asp:Label ID="Label_AssemblyPart" runat="server" Text='<%# Bind("AssemblyPart") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Part Image">
<ItemTemplate>
<a href="javascript:void(window.open('<%# "ShowImage.aspx?PID="+ Eval("PartImage")%>','_blank','toolbar=no,menubar=no'))">
<asp:Image ID="FullImage" ToolTip="Click to download the full size image."
runat="server" ImageUrl='<%# "ShowThumb.aspx?size=120&PID="+ Eval("PartImage") %>' /></a>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Part Image 2">
<ItemTemplate>
<a href="javascript:void(window.open('<%# "ShowImage.aspx?PID="+ Eval("PartImage2")%>','_blank','toolbar=no,menubar=no'))">
<asp:Image ID="Image1" ToolTip="Click to download the full size image."
runat="server" ImageUrl='<%# "ShowThumb.aspx?size=120&PID="+ Eval("PartImage2") %>' /></a>
</ItemTemplate>
</asp:TemplateField>
<asp:CheckBoxField DataField="NonInventoryPart" HeaderText="NonInventoryPart" SortExpression="NonInventoryPart" />
<asp:TemplateField HeaderText="Updated By">
<ItemTemplate>
<asp:Label ID="UserNameLabel" runat="server" Text='<%# Bind("CreatedByUser") %>' ReadOnly="True"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Last Modified">
<ItemTemplate>
<asp:Label ID="ModifiedDateLabel" runat="server" Text='<%# Bind("LastModifiedDate") %>' ReadOnly="True"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Fields>
<FooterStyle BackColor="#00198D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#00198D" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="White" ForeColor="Black" Width="300px" />
</asp:DetailsView>
</td>
</tr>
</table>
</td>
</tr>
</table>
</table>
</td>
</tr>
</table>
</table>
</td>
</tr>
</table>
</table>
</td>
</tr>
</table>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
DataSourceMode="DataSet"
SelectCommand="SELECT Stuff">
<FilterParameters>
<asp:ControlParameter Name="UsedByOEM" ControlID="DDL_OEM" PropertyName="SelectedValue" />
<asp:ControlParameter Name="ItemType" ControlID="DDL_ItemTypes" PropertyName="SelectedValue" />
<asp:ControlParameter Name="GroupType" ControlID="DDL_GroupTypes" PropertyName="SelectedValue" />
</FilterParameters>
</asp:SqlDataSource>
<a></a>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConflictDetection="CompareAllValues"
SelectCommand="SELECT Stuff">
<SelectParameters>
<asp:ControlParameter ControlID="GridView1" Name="ID" PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>
</ContentTemplate>
</asp:UpdatePanel>

Answer 1

Did you try giving the controls a group name?