ScriptManager.RegisterStartupScript(this, GetType(), "showalert", "alert('Remarks is Required Field');", true);
Response.Write("<script LANGUAGE='JavaScript' >alert('Account Success Inserted');document.location='" + ResolveClientUrl("Account.aspx") + "';</script>");
Note:-If your Srcript manager message not show you write (return;) after script manager
Response.Write("<script LANGUAGE='JavaScript' >alert('Account Success Inserted');document.location='" + ResolveClientUrl("Account.aspx") + "';</script>");
Note:-If your Srcript manager message not show you write (return;) after script manager