在统计记录数时报错
string constr = ConfigurationManager.ConnectionStrings["gsbConnectionString"].ConnectionString;
SqlConnection con = new SqlConnection(constr);
int maiid = Int32.Parse(ddlP.SelectedValue.ToString());
string selconunt = "select count(pname) from plname where fid='" + maiid + "'";
con.Open();
SqlCommand cmd = new SqlCommand(selconunt,con);

int count =cmd.ExecuteScalar();//有错误吗？
con.Close();


if (count>0)

Response.Write("<script>alert('存在子类，无法删除！')</script>");
我在代码中已经标注了，该地方报错，是什么原因，请大家指点，谢谢！

[解决办法]
怎么两个帖子一样的
另外一个我也回答了