求帮忙

[女孩坏坏]

为什么异常不能捕捉到？
try
{
if (RadioButton1.Checked)
{
string str = "select * from Book where BookName='" + this.TextBox1.Text + "'";
DataTable dt = DB.getdt(str);
if (dt.Rows.Count > 0)
{
Session["name"] = this.TextBox1.Text.Trim();
Response.Write("<script>location='shumu1.aspx';</script>");
}

}
else if (RadioButton2.Checked)
{
string str = "select * from Book where BookID='" + this.TextBox1.Text + "'";
DataTable dt = DB.getdt(str);
if (dt.Rows.Count > 0)
{
Session["id"] = this.TextBox1.Text;
Response.Write("<script>location='shumu.aspx';</script>");
}

}
}
catch (Exception ex)
{
Response.Write("<script>alert(" + ex.Message + ")</script>");
//Console.WriteLine("an error ourced");
}

[licai1210]

你就代表没错误啊

[yuji821]

那就没有异常啊

[女孩坏坏]

是故意制造异常却不能捕捉

[bladeblue]

[Quote=引用 2 楼 的回复:]

那就没有异常啊
[/Quote]
有异常可以捕捉，没有异常可以先制造异常然后再捕捉。