1. ClientScriptManager cs = Page.ClientScript; if (!cs.IsStartupScriptRegistered(this.GetType(), "Alert")) cs.RegisterStartupScript(this.GetType(), "Alert", "alert('Please Enter valid data');", true); 2. ClientScriptManager cs = Page.ClientScript; cs.RegisterClientScriptBlock(this.GetType(), "MsgWindow", "alert('Please Enter valid data');", true); 3. Response.Write("<script type='text/javascript'>alert('Please Enter valid data');</script>");
ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "myFunction", "<script type='text/javascript'>function_name();</script>", false);
var
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