See embedding on the Voidspace site.
An example there, The IronPython Calculator and the Evaluator
works over a simple python expression evaluator called from a C#
program.
public string calculate(string input)
{
try
{
ScriptSource source =
engine.CreateScriptSourceFromString(input,
SourceCodeKind.Expression);
object result = source.Execute(scope);
return result.ToString();
}
catch (Exception ex)
{
return "Error";
}
}