How to Disable/Enable Command Buttons in on the KeyUp Routine

Written by jim campbell
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Each time a user presses a key on the keyboard, the "KeyDown" and "KeyUp" events trigger in a VB.NET application. You can use these events to disable and enable a form button. Coding for this event means the button's active state will toggle each time a user presses a key.

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  1. 1

    Click the Windows "Start" button and select "All Programs." Click "Microsoft .NET," then click "Visual Studio" to open the VB.NET programming software.

  2. 2

    Double-click the project file name in the list of recent projects to load the code. After the code pages load, right-click the form you want to use to monitor keyboard activity. Click "View Code" to open the form's code file.

  3. 3

    Scroll down to the line of code labelled "Public Event KeyUp As KeyEventHandler." This code starts the function. You will place your button code after this line of code.

  4. 4

    Type the following command to disable the button:

    button1.Enabled = False

    Activating this code "grays out" the button, so it is not active but visible for the user.

  5. 5

    Type the following code to enable the button:

    button1.Enabled = True

    The code above returns the button to its active, clickable state.

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