REQUIRED FIELD VALIDATION
The RequiredFieldValidator control ensures that the required field is not empty. It is generally tied to a text box to force input into the text box.
RequiredFieldValidator validation control make an asp.net web server input control as like a mandatory field.
The RequiredFieldValidator control ensures that the required field is not empty. It is generally tied to a text box to force input into the text box.
RequiredFieldValidator validation control make an asp.net web server input control as like a mandatory field.
DEMO
Html Coding
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr><td>
<asp:Label ID="Label1" runat="server" Text="Name"></asp:Label>
<td>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1"
runat="server"
ControlToValidate="TextBox1" ErrorMessage="*"></asp:RequiredFieldValidator>
</td></td></tr>
<tr><td>
<asp:Label ID="Label2" runat="server" Text="Country"></asp:Label>
</td><td>
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem>Select Country</asp:ListItem>
<asp:ListItem>Australia</asp:ListItem>
<asp:ListItem>India</asp:ListItem>
<asp:ListItem>UK</asp:ListItem>
<asp:ListItem>US</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2"
runat="server"
ControlToValidate="DropDownList1"
ErrorMessage="Please Select Country"
InitialValue="Select Country"></asp:RequiredFieldValidator>
</td></tr>
<tr><td colspan="2">
<asp:Button ID="Button1" runat="server" Text="Save" />
</td></tr>
</table>
</div>
</form>
</body>
</html>
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