Inan asp.net windows forms application we are using in code behind as MessageBox.Show("I am message box");
Wecan also make equivalent to that using asp.net web application.
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
protected void Button1_Click(object sender, EventArgs e)
{
string input = "I am message box";
ClientScript.RegisterStartupScript(this.GetType(), "messagebox", "alert('Message:" + input + "');", true);
}
Output:
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