Asp.net Validation Summary control

ValidationThe appropriate control is used to summarize all the verification errors on the page.

Following are main properties of the validation control.

ShowMessageBox	true/false. Popup alert box with all validation error, if true.
ShowSummary	true/false. Display summary of all errors on the page, if true.
DisplayMode	BulletList/List/SingleParagraph. Used to display all validation errors in specified format.
HeaderText	Used to write the header of the error summary.
ValidationGroup	The input control is used to specify the group name for which the summary will be shown.

         
Example -
          
// Form & Validation Control /////////////////////////
<asp:Label ID="lbl" AssociatedControlID="TextBox1" runat="Server" Text="Write into TextBox"></asp:Label>
    <asp:TextBox ID="TextBox1" runat="Server"></asp:TextBox>
    <asp:RequiredFieldValidator ID="req1" runat="Server" ControlToValidate="TextBox1" ErrorMessage="1st TextBox is Mandatory field" Text="<br>Please write something in 1st  Box."></asp:RequiredFieldValidator>
    <asp:Button ID="btnSubmit" runat="Server" OnClick="WriteTextBoxValue" Text="Submit" />               
    <asp:ValidationSummary ID="ValidationSummary" runat="Server" ShowMessageBox="true" ShowSummary="true" DisplayMode="List" HeaderText="Following error occured." />

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