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Re: Confusion..!! Meth Ferrel13-Jul-09 3:21 Meth Ferrel 13-Jul-09 3:21  you are not at all getting my point dear. what i am trying to say is,i just want to change all the forms according to the menu clicked. The parent form shuold remain open. i am using the code as this.Hide(); form2.ShowDialog(); this.Close(); i have to change this code accordingly to fulfill my needs. Re: Confusion..!! dan!sh 13-Jul-09 17:53 dan!sh 13-Jul-09 17:53  Meth Ferrel wrote: form2.ShowDialog(); If you are able to use ShowDialog, this means the form, is not the MDI child of the parent. If you are using MDIs, you will not be allowed to use ShowDialog for showing the child forms. Re: Confusion..!! Meth Ferrel14-Jul-09 2:53 Meth Ferrel 14-Jul-09 2:53  its the inherited form where the form is inherited by the mdiparent form. i dont find any option as MDIChild in the add new item window. Re: Confusion..!! Baeltazor12-Jul-09 22:00 Baeltazor 12-Jul-09 22:00  Hey there, Have you considered looking into MDI's? Here's a link for a bit of reading. I'm sorry I can't help you anymore than this as I have not used them myself, but I have heard alot about them being used for this reason. Introduction to MDI Forms with C#[^] Hope this helps. Jase. MAC ADDRESS sanforjackass12-Jul-09 21:25 sanforjackass 12-Jul-09 21:25  How Can I Get The Mac Address Re: MAC ADDRESS dan!sh 12-Jul-09 21:29 dan!sh 12-Jul-09 21:29  Like this[^]. Re: MAC ADDRESS sanforjackass12-Jul-09 21:46 sanforjackass 12-Jul-09 21:46  What Is The Namespace To Do That Re: MAC ADDRESS dan!sh 12-Jul-09 21:58 dan!sh 12-Jul-09 21:58  System.Management. In Visual Studio, if you open the Object Browser and paste the name of class, you will get all the information about it. Re: MAC ADDRESS sanforjackass12-Jul-09 22:07 sanforjackass 12-Jul-09 22:07  But The ManegmentScope Does Not Work Why? Re: MAC ADDRESS dan!sh 12-Jul-09 22:15 dan!sh 12-Jul-09 22:15  sanforjackass wrote: ManegmentScope ManagementScope Re: MAC ADDRESS sanforjackass12-Jul-09 22:21 sanforjackass 12-Jul-09 22:21  When I Put The Namespace using System.Management; The ManagementScope Does Not Work Re: MAC ADDRESS dan!sh 12-Jul-09 22:46 dan!sh 12-Jul-09 22:46  What is the error? Re: MAC ADDRESS sanforjackass12-Jul-09 22:48 sanforjackass 12-Jul-09 22:48  The type or namespace 'ManagementScope' could not be found... Re: MAC ADDRESS dan!sh 12-Jul-09 22:55 dan!sh 12-Jul-09 22:55  Add a reference to System.Management in your application. Re: MAC ADDRESS sanforjackass12-Jul-09 22:57 sanforjackass 12-Jul-09 22:57  How? Re: MAC ADDRESS dan!sh 12-Jul-09 23:00 dan!sh 12-Jul-09 23:00  Like this[^]. System.Management will be in the first tab itself. Re: MAC ADDRESS sanforjackass12-Jul-09 23:29 sanforjackass 12-Jul-09 23:29  There IS An Erorr ManagementScope theScope = new ManagementScope("\\\\computerName\\root\\cimv2"); StringBuilder theQueryBuilder = new StringBuilder(); theQueryBuilder.Append("SELECT MACAddress FROM Win32_NetworkAdapter"); ObjectQuery theQuery = new ObjectQuery(theQueryBuilder.ToString()); ManagementObjectSearcher theSearcher = new ManagementObjectSearcher(theScope, theQuery); ManagementObjectCollection theCollectionOfResults = theSearcher.Get(); foreach (ManagementObject theCurrentObject in theCollectionOfResults) { string macAdd = "MAC Address: " + theCurrentObject["MACAddress"].ToString();<-----------Erorr(Object Reference not set to an ...) MessageBox.Show(macAdd); } What can I Do? Re: MAC ADDRESS J4amieC13-Jul-09 0:08 J4amieC 13-Jul-09 0:08  The key here is debugging. It is a skill you must learn if you want to learn programming. First thing to do is set a breakpoint on any of the lines above the foreach(..). Then start the programming in debug mode, I use F5, but you can do it from the menu if you prefer. Then when the code stops at your breakpoint, begin examining the object's in scope paying attention to see if any are null. Im guessing it could be that theCollectionOfResults is null based on the location of the error, but you should see for yourself. When you know what is null, you can work backwards to see which specific line of code is not behaving as you expect. It may be that you dont have permissions to read the MACAddress of the specified computer, it may be that that computer is unable to give you a MACAddress (you used to need a network adapter to have a MACAddress - this might not be true now). I hope that helps. good day. Re: MAC ADDRESS Henry Minute13-Jul-09 0:10 Henry Minute 13-Jul-09 0:10  sanforjackass wrote: What can I Do? You really seem to be out of your depth with this problem, you are asking questions about the most basic of .NET programming operations (how to add a reference, for example) so I would suggest that what you can do is to get a beginners book on C# and .NET and work through it carefully. There are several free ones on the web some for those totally new to programming and some for those transferring from other languages. A forum like this is not the place to be spoon-fed, solutions. To answer your most recent problem. The error is being caused because there is either no such thing as theCurrentObject["MACAddress"] i.e. no such member, or, more likely, the content of theCurrentObject["MACAddress"] is null. So test for null before trying to access it and act on the result of that test. Henry Minute Do not read medical books! You could die of a misprint. - Mark Twain Girl: (staring) "Why do you need an icy cucumber?" “I want to report a fraud. The government is lying to us all.” Re: MAC ADDRESS sanforjackass13-Jul-09 0:39 sanforjackass 13-Jul-09 0:39  I Want My Own Mac Address How Can I Get It? Re: MAC ADDRESS Henry Minute13-Jul-09 0:45 Henry Minute 13-Jul-09 0:45  J4amieC has told you how to find out what is going wrong in your code. Follow his advice. If you are unable to resolve the problem by doing that, you might try Googling for getting mac address for computer. I did and got loads of hits. If you want to cut down on the number, refine the search, try getting mac address for computer c#. Henry Minute Do not read medical books! You could die of a misprint. - Mark Twain Girl: (staring) "Why do you need an icy cucumber?" “I want to report a fraud. The government is lying to us all.” Re: MAC ADDRESS #realJSOP13-Jul-09 1:02 #realJSOP 13-Jul-09 1:02  sanforjackass wrote: I Want My Own Mac Address How Can I Get It? People aren't generally assigned their own MAC address, so I think your only recourse is to purchase a network card. Each one comes with a MAC address. "Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997 ----- "...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001 Re: MAC ADDRESS #realJSOP13-Jul-09 2:15 #realJSOP 13-Jul-09 2:15  Dude, you're a complete retard, aren't you... "Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997 ----- "...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001 Re: MAC ADDRESS #realJSOP13-Jul-09 1:04 #realJSOP 13-Jul-09 1:04  From the other stuff you posted, I'm surprised that you understand the concept of a namespace. "Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997 ----- "...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001 Re: MAC ADDRESS #realJSOP13-Jul-09 0:28 #realJSOP 13-Jul-09 0:28  Which MAC address? "Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997 ----- "...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

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