public void postMessage(MessagePost msgPost)
 {
     messageListData.Add(msgPost);
     Repeater1.DataBind();  //update the message post list
 }
 public void postMessage(string strMessageStr, string strSenderName, string strImageURL)
 {
     MessagePost msgPostStruct = new MessagePost(strMessageStr, strSenderName, strImageURL);
     this.postMessage(msgPostStruct);
 }