assignig text to text box from other class.

Question

Hi There i am working on a windows application which implements communication between two systems using TCP/IP protocol. my form contains a multiline text box in which i want to display the text/data received. i am reading data on the socket using asynchronous/non-blocking method. the method for reading data on socket is in different class. My problem is: i get data on the socket which i pass to a function on form. but the data is not displayed in the text box. the string if displayed in message box it is dispalyed. in short the function on main form gets data received by server but it is not displayed in tex box. Please help me in the matter. Thanks in advance.

naura pax · Answer

Hi It could be the passwordchar property of your textbox set to blank.

Pravara Patil · Answer

Nothing is displayed in the text box. no matter we append new line or not. I tried assigning hardcoded value to the text box in trial function like: txtReceivedMsg.Text = Hi; still nothing is diaplayed. I am not able to figure out the reason behind this kind of behaviour.

naura pax · Answer

Hi Its not the new instance. when you use AppendText function for System.Environment.NewLine it pushes the text upwards. Remove the last line of your string display method where you pass System.Environment.NewLine to your AppendText method and test the application.

Pravara Patil · Answer

I have set the Multiline and Readonly property of the text box. the height is also fairly large. as the text box is read only i can not try deleting contents of text box. still i'll try by enabling scroll bars of the text box. do you think the code has some instance issue? i mean new instance of form is being created and due to that text box is not displaying the data?

naura pax · Answer

Hi Have you set multiline property of your textbox ( txtReceivedMsg) to true? If yes then either set it to false or increase the textbox's height. Or simply remove line using txtReceivedMsg.AppendText( System.Environment.NewLine) from your code. For test right now don't change codejust run your application and press delete button in your textbox several times.. you might see your text. Please tell me if i'm correct.

Pravara Patil · Answer

Here is the code: Form1.cs (which contains text box txtReceivedMsg ): public void trial( string strMsg) { MessageBox .Show(strMsg); txtReceivedMsg.AppendText(strMsg); txtReceivedMsg.AppendText(System. Environment .NewLine); } the above function is called from a callback function in clsClass.cs class. here is the code: public static void ReceiveData( IAsyncResult Ar) { clsTCPIP objTCPIP = ( clsTCPIP )Ar.AsyncState; NetworkStream networkStr = objTCPIP.netStream; frmAdvTCPIP frm = new frmAdvTCPIP (); int intCount = 0; while (objTCPIP.byData[intCount] != '\0' && intCount { ++intCount; string strReceived = Encoding .UTF8.GetString(objTCPIP.byData 0 intCount).Trim(); if (strReceived.Length > 0) { objTCPIP.strMsgReceivedbyserver = strReceived; } } try { int intBytesCount = networkStr.EndRead(Ar); if (intBytesCount > 0) { // clean old data out of the buffer for ( int i = 0; i { objTCPIP.byData[i] = 0; } networkStr.BeginRead(objTCPIP.byData 0 objTCPIP.byData.Length ReceiveData objTCPIP); } frm.trial(objTCPIP.strMsgReceivedbyserver); } catch ( IOException IOEx) { objTCPIP.ServerSock.Shutdown( SocketShutdown .Both); objTCPIP.ServerSock.Close(); networkStr = null ; } catch ( Exception strEx) { objTCPIP.ServerSock.Shutdown( SocketShutdown .Both); objTCPIP.ServerSock.Close(); networkStr = null ; } finally { networkStr = null ; } }

naura pax · Answer

Hi there You've got to post your code to make it clear. Your class the method you 've pointed out and also the form where you're trying to set textbox text property.