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Set panel default button gives error, must be ibuttoncontrol

I am trying to set default button for asp panel. Instead of asp button I am using button control with type="submit". I am getting error: "The DefaultButton of 'pnlSSN' must be the ID of a control of type IButtonControl.”.
This is the code I have:
<div class="input-append" id="divSSN"> <asp:Panel ID="pnlSSN"
runat="server" DefaultButton="btnSSN">
<asp:TextBox ID="txtSSN" runat="server" CssClass="span8" Width="200px"
placeholder="Enter valid Social Security Number">
ValidationGroup="validationSSN" />
<button runat="server" id="btnSSN"
onserverclick="btnSSN_Click" causesvalidation="true"
ValidationGroup="validationSSN" class="btn"
type="submit">Search</button> </asp:Panel> </div>
I also tried setting both pnlSSN.DefaultButton = btnSSN.ClientID; and pnlSSN.DefaultButton = btnSSN.ID; but I am getting the same error.

DefaultButton must be ASP.Net button server control instead of html Button
<asp:Panel runat="server" ID="pnlSSN" DefaultButton="btnSSN">
...
<asp:Button runat="server" ID="btnSSN" OnClick="btnSSN_Click" />
</asp:Panel>
Besides, your asp:TextBox tag is not well-formatted. Remove > at the end of Number">

Multiline textfield in C# changes layout?

I am using the ASP.net framework. I am building a web form using the design view of the .aspx file. I have made a very simple form, the below is the code in the .aspx file.
<asp:TextBox ID="TextBox3" runat="server" Height="60px" Width="550px" TextMode="MultiLine"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Height="60px" Text="Button" Width="100px"/>
<asp:Button ID="Button2" runat="server" Height="60px" Text="Button" Width="100px" />
The problem is that when I set the TextMode to MultiLine the position of buttons changes too.
Textmode set to single line:
Textmode set to multi line:
Any explanation for this?

how to give required field validator to textbox in gridview?

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" Height="146px"
Width="308px">
<Columns>
<asp:TemplateField HeaderText="Original Price" ControlStyle-Width="100px">
<ItemTemplate>
<asp:TextBox ID="txtOriginalPrice" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfv" runat="server" ControlToValidate="txtOriginalPrice"
ValidationGroup="GridView1" Display="Static" ErrorMessage="" Text="*"></asp:RequiredFieldValidator>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
I am using above code but its not working though I have put requirefield validator it does not show me the '*'

Yes, your requiredfieldvalidator is certainly there, and it knows which control to validate.What is missing is "when to validate that control".And to answer this question you need to add your textbox the same ValidationGroup with your requiredfieldvalidator and also the control(this can be a button for example) causes to do a validation.So your code will be like
<%--<asp:Button ID="Button1" runat="server" ValidationGroup="GridView1" Text="Benjamin"...Somewhere in your code--%>
<asp:TextBox ID="txtOriginalPrice" runat="server" ValidationGroup="GridView1"></asp:TextBox>
So don't forget these question
What to validate?(a textbox)
When to validate?(after a button click)
After what action try to validate?(a button click)
With what to validate?(a requiredfieldvalidator)
All of these controls must have the same ValidationGroup.

In case you need the validation to be performed then check for something like this
<asp:Button ID="btnAdd" runat='server' ValidationGroup='GridView1' CausesValidation='true'.....
So now when you click the add button it will validate for those controls falling under the validation group you mentioned else the default value is "" hence you won't find any validation triggered.

Add ValidationGroup to TextBox (txtOriginalPrice), Button and other controls.

ASP.NET validation summary inside formview doesn't work

I have a validation summary inside a asp.net formview and the validators just don't seem to trigger the validation summary.
Things I already tried:
Enable the ViewState on everything.
Set the ClientID to static.
Set the ValidationGroup to the same group on both all validators and the summary.
Used Google to search for a solution.
Anyone has any ideas on how to handle this?
Code. Formview declaration:
<asp:FormView ID="FormViewPerson" runat="server" DataSourceID="ObjectDataSourcePerson"
DefaultMode="Edit" OnItemUpdating="FormViewPerson_ItemUpdating" OnItemCommand="FormViewPerson_ItemCommand"
OnItemUpdated="FormViewPerson_ItemUpdated" Width="100%">
Any of the textboxes with the validator:
<td> <asp:TextBox ID="NumberTextBox" runat="server" Text='<%# Bind("Number") %>'
TabIndex="10" CausesValidation="True" ClientIDMode="Static" />
<asp:RequiredFieldValidator ID="RequiredFieldValidatorNumber" runat="server" ControlToValidate="NumberTextBox"
ErrorMessage="Number is Required" ForeColor="Red"
ValidationGroup="EditPerson">*</asp:RequiredFieldValidator>
</td>
And the submitbutton:
<asp:ValidationSummary ID="ValidationSummaryPerson" runat="server"
ForeColor="Red" ClientIDMode="Static" CssClass="validation"
ShowMessageBox="True" ValidationGroup="EditPerson" ViewStateMode="Enabled"
/>
<asp:Button ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update"
Text="Save" ValidationGroup="EditPerson" CssClass="ButtonStyle" TabIndex="90" />
<asp:Button ID="EditCancelButton" runat="server" CausesValidation="False" CommandName="Cancel"
Text="Cancel" CssClass="ButtonStyle" TabIndex="100"
ValidationGroup="EditPerson" />

Hope the CausesValidation for the button is set to true.

Well, I fixed the issue. If anyone else encounters this problem try the following:
Ensure there is only one (1) validation group on the entire form.
Set "causesvalidation" to "true" on the submitbutton.
Check, double check and triple check the spelling of your validationgroup property on all relevant controls.
Be on the lookout for javascript errors in your client-side scripts. They can cause havoc.

problem with asp.net validationcontrol

I have a textbox and I have set required validationcontrol on it on click of a button.
<asp:TextBox runat="server" ID="name" Width="120"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfvname" runat="server" ControlToValidate="name" ErrorMessage="Name is required" Display="Dynamic" />
</td>
but the problem is when I am clicking on modify shared webpart and when I click on APPLY or OK button it is not saving as my form is empty . and I can't put
CausesValidation="false" on that button as this button is by default in sharepoint.
Any idea how to resolve this...?

You can use the ValidationGroup property to group all the Validators and validation fields together.

Yes using the ValidationGroup tag will help to relate the controls in a single form and will tell the submit button which fields are associated. Also make sure you have a ValidationSummary control on the page with the same ValidationGroup value. Also consider adding an InitialValue="" onto the TextBox control.
<asp:ValidationSummary ID="vs1" ShowMessageBox="true" ShowSummary="false" DisplayMode="List" runat="server" ValidationGroup="Form" HeaderText="There were problems with your submission:" />
<asp:TextBox runat="server" ID="name" Width="120"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfvname" ValidationGroup="Form" runat="server" ControlToValidate="name" InitialValue="" ErrorMessage="Name is required" Display="Dynamic" />
<asp:LinkButton ID="lnkSubmit" Text="Submit" OnClick="lnkSubmit_Click" ValidationGroup="Form" runat="server"></asp:LinkButton>