Ques. in VC#.Net

[Andy Rama]

Hi to all, How can I add code to User Control Unload Event? ( Code at time of Form Close in UserControl Code). What is the use of RowHeader in DataGridView? Can I show index automatically to each row? How Can I validate a path of a file? Thanks & Best Regrads, Aniket Salunkhe

[Daniel Persson]

what do you mean by validating the path of a file? Check if it contains "valid" characters? use regexp. If you wan't to check if the folder specified exist use: System.IO.Directory.Exists(folder) If you wan't to check if the file exists use: System.IO.File.Exists(file) You will have to explain a little bit more for me what you mean by your first question. Every form has a FormClosing event, maybe you could use it to trigger other events/methods to do your work...

[Andy Rama]

Hi, I have designed an User Control having 'DataGridView' in it, which uses XML-File to show data in grid. But I want to Write the XML-File (changes made in grid ) when application closes. How to do that? What event should I use for that in the 'User Control '? Is there any Unload event for User Control? Thanks & Best Regards, Aniket Salunkhe

[Daniel Persson]

ok, so what if you make a function in your control, let's call it SaveStructure() In your mainform/mainwindows/mainapplication you add this code to FormClosing event: MyFancyInstanceOfMyObject.SaveStructure(); done ... To be honest I don't know(I don't think there is an UnLoad event for user-controls by standard). But this should work anyway...

[Andy Rama]

Hi, Thanks. Same think I have done. I thought that I am missing some thing. But if you have another solution for my User Control just tell me. Also I have another query... What is the use of RowHeader in DataGridView? Can I add a column (1st column) such that it will show index (automatically increasing/decreasing) of each row? i.e. same as Numbering done in Word Document Thanks & Best Regards, Aniket Salunkhe