Needing SDK Assistance

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SDK

Hello,
I need assistance with coding SDK. What I am trying to do is display an indicator on the screen when a duplicate value is entered into a data field/box. For example, if (2) people take a call on "ticket 123" I need an indicator to appear on the screen stating something to the extent of "ticket# currently in use". Can you assist?

Will this SDK work?
PropID a = new PropID();
a.Name = "My Prop ID";
CreateRequest req = new CreateRequest();
req.Parameters.Add("SuppressDuplicateDetection", false);
req.Target = a;
try
{
service.Execute(req);
}
catch (FaultException<organizationservicefault> ex)
{
if (ex.Detail.ErrorCode == -2147220685)
{
// Account with name "My Property ID" already exists
}
else
{
throw;
}
}