Oh... ok I am using debug builds... but I have not copied PDB file to the production machine. When I tested Environment.StackTrace I was on my development machine. I bet I won't get line numbers from that either on the production machine. Thanks again!

Thanks you for your reply. In my application I'm trying to display records in a table that let me know that some services I have written are working. At this point I'm updating the display on a button click. I tried to apply the code I found in the example you pointed me to. You can see the error message from my exception trap. Can you tell me where I when wrong? private void m_btnUpdate_Click(object sender, System.EventArgs e) { this.sqlDataAdapter1.Fill(this.imAliveDataSet1,0,0,"ImAlive"); // Gets the DataGridTextBoxColumn from the DataGrid control. DataGridTextBoxColumn myTextBoxColumn; myTextBoxColumn = null; // Assumes the Time column is a DataGridTextBoxColumn. try { myTextBoxColumn = (DataGridTextBoxColumn)dataGrid1. TableStyles["ImAlive"].GridColumnStyles["Time"]; } catch (Exception excpt) { string strMsg = string.Format("{0} Exception caught.", excpt); } // Gets the DataGridTextBox for the column. DataGridTextBox myGridTextBox; myGridTextBox = (DataGridTextBox) myTextBoxColumn.TextBox; strMsg "System.NullReferenceException: Object reference not set to an instance of an object. at FordMon.Form1.m_btnUpdate_Click(Object sender, EventArgs e) in c:\source\ford\fordmon\fordmon\form1.cs:line 227 Exception caught." string

Thanks so much for all your help. In my current work I'm really just using CPrintDialog to get the printer name. I'm doing my own opening of the printer with some low level stuff. I was only concerned that CPrintDilaog might fill the port name for me and might overwrite memory if I had not allow enough space for the port name before the call. Hum... this kind of takes me back to my origional problem... I was concerned that I might be overwriting memory that I don't own. I hope this way is safer. Maybe I should look at EnumPrinters() to see if that could help make this a safe call. Thanks again!

You've definitely convinced me not to upgrade!! :laugh: Thanks for the help, Bill

Yes. They are described in the documentation for the SDK. If you are really documenation adverse, try running the DEPENDS utility that ships with VC. It will tell you all the things your program needs to run. Go to a standard configuration system and see which ones are missing. If this is for wide distribution, better go with the documentation. P.S. Remember, when redistributing other peoples software, check the licensing agreements. This is especially true if you are developing commercial software and distributing Microsoft stuff. Hope this helps, Bill

Try String.Format()

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