Chars received

Hi I am trying to figure out why my method keeps only showing me the first character from a sent string. I would like it to show all the characters that were sent.

public void OnDataReceived(IAsyncResult asyn)
{
try {
SocketPacket socketData = (SocketPacket)asyn.AsyncState;

int iRx = 0;

iRx = socketData.currentSoc.EndReceive(asyn);

char[] chars = new char[iRx];
System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder();

int charLen = d.GetChars(socketData.dataBuffer, 0, iRx, chars, 0);

System.String szData = new System.String(chars);

MessageBox.Show(szData);