Compare Exchange: How to Put Compare Exchange Value

Method:

public PutCompareExchangeValueOperation(string key, T value, long index)

Returned object:

public class CompareExchangeResult<T>
{
    public bool Successful;
    public T Value;
    public long Index;
}

CompareExchangeResult<string> compareExchangeResult
    = store.Operations.Send(
        new PutCompareExchangeValueOperation<string>("Emails/foo@example.org", "users/123", 0));

bool successful = compareExchangeResult.Successful;
// If successfull is true: then Key 'foo@example.org' now has the value of "users/123"

// Get existing value
CompareExchangeValue<User> readResult =
    store.Operations.Send(
        new GetCompareExchangeValueOperation<User>("AdminUser"));

readResult.Value.Age++;

// Update value
CompareExchangeResult<User> saveResult
    = store.Operations.Send(
        new PutCompareExchangeValueOperation<User>("AdminUser", readResult.Value, readResult.Index));

// The save result is successful only if 'index' wasn't changed between the read and write operations
bool saveResultSuccessful = saveResult.Successful;