Pop up alert message box in ASP.NET C#,

We can get pop up alert message box using below code :-

Code :-

string message = "welcome in code solution";

ClientScript.RegisterStartupScript(GetType(), "alert", "alert('" + message + "');", true);

For more understanding , I am giving here this example:-

Source Code:-

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

</head>

<body>

<div>

<asp:Button ID="btnmsgbox" runat="server" onclick="btnmsgbox_click"

Text="Alert pop up message box " />

</div>

</form>

</body>

</html>

Code behind (c#):-

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class alert : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void btnmsgbox_click(object sender, EventArgs e)

{

string message = "welcome in code solution";

ClientScript.RegisterStartupScript(GetType(), "alert", "alert('" + message + "');", true);

}

Out-put:-

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