Event and mixing Data Concurrently

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C#

Hai, Am doing a project of Transferring data over udp, Now am facing a problem,

Am Getting stream of data from two events.

event1 give

private void ondatareceived_one(byte[] values)
{
mixdata(1, values);
}

event2 give

private void ondatareceived_two(byte[] values)
{
mixdata(2, values);
}}

i have to mix this two byte array values

this events triggers 10 times per second


the mixing method is

Dictionary<int,byte[]> dict = new Dictionary<int,byte[]>(); 
private void mixdata(int index, byte[] values)
{
dict[index] = values;

if(dict.count==2)
{
list<byte[]> listdata= dict.values.Tolist();
dict.clear();

foreach (byte[] values in listdata)
{
// mixing datas from two byte[]

} 
}
}

This implementation is very slower, i need an alternate way which perfoms very faster..
Kindly help me...