public override Response Invoke(IChaincodeStub stub)
{
Assert.AreEqual(stub.Function, "invoke");
Assert.AreEqual(stub.Args.Count, 3);
string aKey = stub.StringArgs[1];
Assert.AreEqual(aKey, "a");
string aVal = stub.GetStringState(aKey);
stub.PutState(aKey, ByteString.CopyFromUtf8("120").ToByteArray());
stub.DelState("delKey");
return(NewSuccessResponse("OK response2"));
}