急,web页面弹出错误对话框问题??

Question

  DataTable dt = pp.GetObjectBySql(SQLString);        if(dt.Rows.Count==0)
        {
            我想在这里弹出一个对话框,就像windowsform里的messagebox一样,该怎么写啊??       
        }
        else
        {
        this.dgObjectbycase.DataSource = dt;
        this.dgObjectbycase.DataBind();
        }

Answer 1

Response.Write("<script language=javascript>alert('警告信息')</script>");