c# - Get Source file,method and line in exception

Question

I am trying to get details from an exception occurred in my c# (4.0) asp.net web application. I have .pdb file in bin folder. The following code is not working as expected -

protected void Button1_Click(object sender, EventArgs e)
{
    try
    {
        //throwing Exception
        using (SqlConnection connection=new SqlConnection(""))
        {
            connection.Open();
        }
    }
    catch (Exception exception)
    {
        //Get a StackTrace object for the exception
        StackTrace st = new StackTrace(exception, true);

        //Get the first stack frame
        StackFrame frame = st.GetFrame(0); //returns {PermissionDemand at offset 5316022 in file:line:column <filename unknown>:0:0}

        //Get the file name
        string fileName = frame.GetFileName(); //returns null

        //Get the method name
        string methodName = frame.GetMethod().Name; //returns PermissionDemand

        //Get the line number from the stack frame
        int line = frame.GetFileLineNumber(); //returns 0

        //Get the column number
        int col = frame.GetFileColumnNumber(); //returns 0              
    }
}

What is wrong here?

update: "StackFrame frame = st.GetFrame(st.FrameCount - 1); " solved this issue.

Answer 1

//Remove this line
StackFrame frame = st.GetFrame(0);

//Add this line
StackFrame frame = st.GetFrame(st.FrameCount - 1);