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.
Example :-
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Required Validator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblFirstName"
Text="First Name"
AssociatedControlID="txtFirstName"
Runat="server" />
<br />
<asp:TextBox
id="txtFirstName"
Runat="server" />
<asp:RequiredFieldValidator
id="reqFirstName"
ControlToValidate="txtFirstName"
Text="Must enter your first name."
SetFocusOnError="true"
Runat="server" ForeColor="#FF0066" />
<br /><br />
<asp:Label
id="lblLastName"
Text="Last Name"
AssociatedControlID="txtLastName"
Runat="server" />
<br />
<asp:TextBox
id="txtLastname"
Runat="server" />
<asp:RequiredFieldValidator
id="reqLastName"
ControlToValidate="txtLastName"
Text="Must enter your last name"
SetFocusOnError="true"
Runat="server" ForeColor="#FF0066" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" onclick="btnSubmit_Click" />
<br />
<br />
<asp:Label ID="Label1" runat="server"></asp:Label>
<br />
<asp:Label ID="Label2" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
protected void btnSubmit_Click(object sender, EventArgs e)
{
Label1.Text = txtFirstName.Text;
Label2.Text = txtLastname.Text;
}
Example :-
Deafault.aspx :-
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Required Validator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblFirstName"
Text="First Name"
AssociatedControlID="txtFirstName"
Runat="server" />
<br />
<asp:TextBox
id="txtFirstName"
Runat="server" />
<asp:RequiredFieldValidator
id="reqFirstName"
ControlToValidate="txtFirstName"
Text="Must enter your first name."
SetFocusOnError="true"
Runat="server" ForeColor="#FF0066" />
<br /><br />
<asp:Label
id="lblLastName"
Text="Last Name"
AssociatedControlID="txtLastName"
Runat="server" />
<br />
<asp:TextBox
id="txtLastname"
Runat="server" />
<asp:RequiredFieldValidator
id="reqLastName"
ControlToValidate="txtLastName"
Text="Must enter your last name"
SetFocusOnError="true"
Runat="server" ForeColor="#FF0066" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" onclick="btnSubmit_Click" />
<br />
<br />
<asp:Label ID="Label1" runat="server"></asp:Label>
<br />
<asp:Label ID="Label2" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
Now add code in the Default.aspx.cs :-
protected void btnSubmit_Click(object sender, EventArgs e)
{
Label1.Text = txtFirstName.Text;
Label2.Text = txtLastname.Text;
}
Output:
No comments:
Post a Comment