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Clearing Datagridview in Visual basic

post #1 of 7
Thread Starter 
I'm making a little tool to do some basic work pinging, trace routing, and running WMIC commands for me. Inputting IPs & Computer Names is being done through a grid using the DataGridView object. I have 6 different buttons that launch different scripts for various IPs, IP Ranges, Computer names, IP trace routes, computer name trace routes, & WMIC commands.

I have a loop setup at the start of each Button_Click to clear the grid but only if you click a different button. I am doing this by changing the value of a String variable and checking its value at the start. The code for this is below...
Code:
        'Set Variables
        Num_Pings = Selector.Value()
        ButtonClick = "Button_Select_IPs"

        'Set Input Grid
        If ButtonClick = "Button_Select_IPs" Then
            Grid_Input.DataMember = Grid_Input.DataMember
        Else
            Grid_Input.DataMember = Nothing
        End If
        Grid_Input.Visible() = True
        Grid_Input.ColumnCount() = 1
        Grid_Input.Columns(0).HeaderText = "IP Address(es)"

The code above is a snippet from 1 of the button clicks. The variable ButtonClick is a string that changes with each of the different buttons. The issue I have is that the loop isn't working. It may just be that I haven't done VB in 6-7 years or it could be the 3AM+ time frame but I just can't figure out why it wont work. Any help from you all would be much appreciated.
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post #2 of 7
Code:
Grid_Input.DataMember = Grid_Input.DataMember

You're assigning the same object to itself. That's an effective no-op...

One thing I don't see though is a loop in that snippet.

Anyway all you need to do is set the data source to null (or Nothing in VB), then call the Clear method on the Rows property.
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post #3 of 7
Thread Starter 
So I am an idiot. I blame it on the time tongue.gif

I'm assigning the variable before I check it so every time its checked its the current value. That's why its not clearing at all.

How would I set an If statement (not a loop....again....i'm a tired idiot) that checks to see if Im clicking the same button twice in a row so that if I do it doesn't clear it but to still clear it if I click a different button.



Hopefully I'm making sense...
Edited by NameUnknown - 4/6/14 at 12:32am
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post #4 of 7
Is it really necessary to clear the data grid view each time you choose a different action?

Would it not make more sense to add a separate button to clear the view? What if you want to use the same set of IP addresses each time you want to execute a different action (e.g. traceroute or ping, etc)...
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post #5 of 7
Thread Starter 
I toyed with the idea putting in a clear button but then decided that I wanted it to auto clear since I use each tool differently. But I guess should I ever disseminate the tool to other people having the clear button is actually more flexible and robust.

Below is a screenshot of the interface thus far. complete and utter work in progress still. Should anyone be interested in having a copy of it once its complete let me know. OR if you have ideas for network based commands to add let me know and I'll add them in.

I know the name makes no sense, it was Sir Pings-A-Lot originally but then I expanded it outside of Pinging only so I expanded it to Nets-A-Lot for Network tools.

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post #6 of 7
OK. Well in any case to implement your way, you should store the current action string in a private member of the class. Then when you click a button, you check to see if the action clicked is the same as what you've stored. If it is, do nothing. If not, clear the view.

However I might suggest you read up on enumerations. Strings really aren't for this purpose. It takes less resources to compare an integral value than it does a string. They are also more flexible (what if you change the value of the action string... now you need to update many places in the code).

http://msdn.microsoft.com/en-us/library/8h84wky1.aspx
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post #7 of 7
Thread Starter 
I will definitely look into that. Its been a long long time since I did any code and I never got far into VB, always like it the most though. Part of the point of making the tool is to brush up and learn it agian so I'll definitely look into doing enumerations for a second version once I have the first one complete and at least functional.

Thanks for all the input.
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