Response.Write不执行解决思路_ASP.NET

Response.Write不执行

C# code

bool flag=true;                DataTable source=ds2.Tables[0];                for(int i=0;i<source.Rows.Count;i++)                {                    double salePrice=Convert.ToDouble(source.Rows[i][9].ToString());                    double costPrice=Convert.ToDouble(source.Rows[i][8].ToString());                    double rate=salePrice/costPrice;                    if(rate<1||rate>99)                    {                        flag=false;                        break;                    }                }                if(flag==false)                {                    Response.Write("<script language=jscript>alert('asdfasdf')</script>");                }

这是我从代码中截除的一段，flag=false，但是Response.Write不弹出窗口，大家帮忙看看是什么原因吧

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Page.RegisterClientScriptBlock("ky", "<script language=javascript>alert('s')</script>");
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断点打if(flag==false)

ClientScript.RegisterStartupScript(Page.GetType(), "","<script>alert('asdfasdf');</script>");

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探讨
我把下面的几百行代码单步了一下，这个alert不直接执行，它在下面的代码都执行完了才弹，很怪异阿，谁遇到过这样的问题吗，有什么好的解决办法吗

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C# code

Response.Write("<script language=jscript>alert('asdfasdf')</script>");Response.End();
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C# codeif(flag==false)                {                    Response.Write("<script language=jscript>alert('asdfasdf')</script>");                    Response.End();//这样就执行了                }
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C# codeResponse.Write("<script>alert('asdfasdf')</script>");Response.End();