I have written couple of custom rules in for FxCop 1.36. I have written code to find weather an opened DataReader is closed or not. But it does not check which DataReader object is calling the Close() method so I can't be sure if all opened DataReader objects are closed!!

2nd: If I am a DataReader in an 'if/else' like

if 1=2
 dr = cmd.ExecuteReader();
else
 dr = cmd2.ExecuteReader();
end if

In this case it will search for 2 DataReader objects to be closed.

I am putting my code for more clarity.

public override ProblemCollection Check(Member member)
{
    Method method = member as Method;
    int countCatch =0;
    int countErrLog = 0;
    Instruction objInstr = null;
    if (method != null)
    {
        for (int i = 0; i < method.Instructions.Count; i++)
        {
            objInstr = method.Instructions[i];
            if (objInstr.Value != null)
            {
                if (objInstr.Value.ToString()
                    .Contains("System.Data.SqlClient.SqlDataReader"))
                {
                    countCatch += 1;
                }
                if (countCatch>0)
                {
                    if (objInstr.Value.ToString().Contains(
                        "System.Data.SqlClient.SqlDataReader.Close"))
                    {          
                        countErrLog += 1;
                    }
                }
            }
        }
    }
    if (countErrLog!=countCatch)
    {
        Resolution resolu = 
            GetResolution(new string[] { method.ToString() });
        Problems.Add(new Problem(resolu));
    }
    return Problems;
}