Implement SweetAlert jQuery Plugin in ASP.Net example

Here I have created sample that will help you out.

HTML

<div>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.0/sweetalert.min.js"></script>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.0/sweetalert.min.css"
        rel="stylesheet" type="text/css" />
</div>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.ClientScript.RegisterStartupScript(this.GetType(), "SweetAlert", "swal('Oops!', 'Something went wrong on the page!', 'error');", true);
    }
}

Screenshot