Introduction:
This article is helps to how Show message box (alert)
using asp.net in code behind.
Source
Page (Design View):
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title> Alert message box using asp.net in code behind </title>
</head>
<body>
<form id="form1" runat="server">
<div>
div class="Column">
<asp:Label ID="lblUserName" runat="server" Text="User Name"></asp:Label>
<asp:TextBox ID="txtUserName" runat="server"></asp:TextBox>
<span class="Mandatory">*</span></div>
<div class="Column">
<asp:Label ID="lblPassword" runat="server" Text="Password"></asp:Label>
<asp:TextBox ID="txtpassword" TextMode="Password" runat="server"></asp:TextBox>
<span class="Mandatory">*</span></div>
<div class="Column" style="padding-left: 150px">
<asp:Button ID="btnLogin" runat="server" BorderColor="Aqua" OnClientClick=" btnLogin_click()"
Text="Login" /></div>
</div>
</form>
</body>
</html>
Code
Behind(C#) :
private void
btnLogin_click(object sender, EventArgs e)
{
if (txtUserName.Text == "")
{
ScriptManager.RegisterStartupScript(this,
GetType(), "Script", "alert('User Name Required')",true);
return;
}
// code here some else wanted
}
Demo
:
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