Out of memory exception in C# Eval function

Question

Possible Duplicate:
How can I prevent CompileAssemblyFromSource from leaking memory?

I am using this http://www.codeproject.com/Articles/11939/Evaluate-C-Code-Eval-Function example to evaluate a c# expression which will be evaluated thousands of time.

public static object Eval(string sCSCode) {
    CSharpCodeProvider c = new CSharpCodeProvider();
    ICodeCompiler icc = c.CreateCompiler();
    CompilerParameters cp = new CompilerParameters();

    cp.ReferencedAssemblies.Add("system.dll");
    cp.ReferencedAssemblies.Add("system.data.dll");

    StringBuilder sb = new StringBuilder("");
    sb.Append("using System;\n" );
    sb.Append("using System.Data;\n");
    sb.Append("namespace CSCodeEvaler{ \n");
    sb.Append("public class CSCodeEvaler{ \n");
    sb.Append("public object EvalCode(){\n");
    sb.Append("return "+sCSCode+"; \n");
    sb.Append("} \n");
    sb.Append("} \n");
    sb.Append("} \n");

    CompilerResults cr = icc.CompileAssemblyFromSource(cp, sb.ToString());

    if( cr.Errors.Count > 0 ){
        MessageBox.Show("ERROR: " + cr.Errors[0].ErrorText, "Error evaluating cs code", MessageBoxButtons.OK, MessageBoxIcon.Error );
        return null;
    }

    System.Reflection.Assembly a = cr.CompiledAssembly;
    object o = a.CreateInstance("CSCodeEvaler.CSCodeEvaler");

    Type t = o.GetType();
    MethodInfo mi = t.GetMethod("EvalCode");

    object s = mi.Invoke(o, null);
    return s;
}

Eval function runs almost (as mentioned above) thousands of time to do its expression evalution inside a for each loop. buts once the loop value reaches 4000 it gives me

System.OutOfMemoryException occured in System.dll

over this line

CompilerResults cr = icc.CompileAssemblyFromSource(cp, sb.ToString());

Then it keeps giving this exception until the loop reaches to end. I created a dump file from task manager and dump file size reaches almost 500MB, I debugged the dump file using WinDbg but cant get to the problem because I am not an expert user of WinDbg so can't figure out why its happening? I am not sure either its memory leakage problem, memory is not being freed by StringBuilder.

1. Will Creating AppDomain solve the problem?

2. Shall I use StringWriter instead of StringBuilder?

Any suggestion or help will be much appreciated.