Error on messagequeue...couldn't fix it.

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ASP.NET

MSMQ

Hi,
I was just trying to use msmq in asp.net.When i tried to click the send button the following error is showing..

public System.Messaging.MessageQueue mq;
    public static Int32 i = 0;

protected void Button1_Click(object sender, EventArgs e)
  {
      System.Messaging.Message mm = new System.Messaging.Message();
      mm.Body = TextBox1.Text;
      mm.Label = "MsgI" + i.ToString();
      i++;
      mq.Send(mm);//Error msg:Object reference not set to an instance of an object.
}

kindly tell me what is this error..

Thank you.