IMapTKey, TValuePutAsync Method (TKey, TValue, Int64, TimeUnit)Hazelcast .Net Client Class Library
Asynchronously puts the given key and value into this map with a given ttl (time to live) value.

Namespace: Hazelcast.Core
Assembly: Hazelcast.Net (in Hazelcast.Net.dll) Version: 3.5.0.6
Syntax

Task<TValue> PutAsync(
	TKey key,
	TValue value,
	long ttl,
	TimeUnit timeunit
)

Parameters

key
Type: TKey
the key of the map entry
value
Type: TValue
the new value of the map entry
ttl
Type: SystemInt64
maximum time for this entry to stay in the map 0 means infinite.
timeunit
Type: Hazelcast.CoreTimeUnit
time unit for the ttl

Return Value

Type: TaskTValue
Task<V> from which the old value of the key can be retrieved.
Remarks

Asynchronously puts the given key and value into this map with a given ttl (time to live) value. Entry will expire and get evicted after the ttl. If ttl is 0, then the entry lives forever.
Task<V> task = map.PutAsync(key, value, ttl, timeunit);
// do some other stuff, when ready get the result
V oldValue = task.Result;
Task.Result will block until the actual map.Put() completes. If the application requires timely response, then task.Wait(timeout) can be used.
try
{
    Task<V> task = map.PutAsync(key, value, ttl, timeunit);
    if(task.Wait(TimeSpan.FromMilliseconds(40)))
    {
       V value = task.Result; 
    }
    else
    {
     //Result not ready
    }

Warning:

This method uses GetHashCode and Equals of binary form of the key, not the actual implementations of GetHashCode and Equals defined in key's class.
See Also

Reference