<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> <script type="text/javascript" src="JScript.js"> </script> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> firstname <asp:Button ID="Button1" runat="server" onclick="Button1_Click" onclientclick=" return validate()" Text="Button" /> </asp:Content>
function validate() { var firstname; firstname = document.getElementById("textbox1").value; if (firstname == "") { alert(" please enter value"); } }
function validate() { var firstname; firstname = document.getElementById('TextBox1').value; if (firstname == "") { alert(" please enter value"); return false; } }
var
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