How to use ValidationSummary control in asp.net

ValidationSummary example: how to use ValidationSummary control in asp.net
ValidationSummaryExample.aspx
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e) {
        Label1.Text = "Your Country: " +
            TextBox1.Text.ToString() +
            "<br />Region: " +
            TextBox2.Text.ToString() +
            "<br />City: " +
            TextBox3.Text.ToString();
            
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>ValidationSummary example: how to use ValidationSummary control in asp.net</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Font-Size="Large" ForeColor="BlueViolet"></asp:Label>
        <br /><br />
        <asp:Label ID="Label2" runat="server" Text="Country Name" AssociatedControlID="TextBox1"></asp:Label>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator
             ID="RequiredFieldValidator1"
             runat="server"
             ControlToValidate="TextBox1"
             ErrorMessage='Input Country!'
             EnableClientScript="true"
             SetFocusOnError="true"
             Text="*"
             >
        </asp:RequiredFieldValidator>
        <br />

        <asp:Label ID="Label3" runat="server" Text="Region Name" AssociatedControlID="TextBox2"></asp:Label>
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator
             ID="RequiredFieldValidator2"
             runat="server"
             ControlToValidate="TextBox2"
             ErrorMessage='Input Region!'
             EnableClientScript="true"
             SetFocusOnError="true"
             Text="*"
             >
        </asp:RequiredFieldValidator>
        <br />
        
        <asp:Label ID="Label4" runat="server" Text="City Name" AssociatedControlID="TextBox3"></asp:Label>
        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator
             ID="RequiredFieldValidator3"
             runat="server"
             ControlToValidate="TextBox3"
             ErrorMessage='Input Region!'
             EnableClientScript="true"
             SetFocusOnError="true"
             Text="*"
             >
        </asp:RequiredFieldValidator>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Submit" OnClick="Button1_Click" />
        <br /><br />
        <asp:ValidationSummary ID="ValidationSummary1" runat="server" HeaderText="Following error occurs:" ShowMessageBox="false" DisplayMode="BulletList" ShowSummary="true" />
    </div>
    </form>
</body>
</html>






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