asp.net执行sql脚本，导出数据库文件到本地

protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection conn= new SqlConnection("server=(local);database=colorring;uid=sa;pwd=;");
conn.Open();
string sqlstr = "exec master..xp_cmdshell 'bcp   /"select  top 100 * from master..aps/" queryout c://aaabbbccc.txt -c '";
SqlCommand cmd = new SqlCommand(sqlstr,conn);

cmd.ExecuteReader();
Label1.Text = sqlstr;
conn.Close();

}