How do I call a C# calculator form from each textbox control in C# application and get the result in it

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Hello All

I have coded a small calculator to do basic + , - , * , /. Now I want this calculator form to be called ( by a hot key say F3 ) from each control eg textbox or datagridview cell and the value of calculator should fill in that textbox/datagridview cell from which it is called
Please Help..
Thanks in Advance

What I have tried:

I an able to call it from a specific textbox..but I want a general code so that it can be called from any textbox control without having to write code for each textbox

Posted 28-Sep-17 23:55pm

PRADEaZX

Updated 29-Sep-17 0:04am

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CHill60 29-Sep-17 6:00am

Put the code into a handler and attach that to each textbox.

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OriginalGriff · Accepted Answer · 2017-09-29T00:04:00

Override the Form.ProcessCmdKey method, and check for the key there:

C#

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
    Keys keyOnly = keyData & ~Keys.Modifiers;
    Keys modifiersOnly = Control.ModifierKeys & (Keys.Shift | Keys.Control | Keys.Alt);
    if (modifiersOnly == 0)
        {
        // Key alone
        switch (keyOnly)
            {
            case Keys.F3:
                ...
                return true;
            }
        }
    return false;
    }

This lets your form handle the key before it gets to any controls.
You then need to find the focussed control, but that's covered here: .net - What is the preferred way to find focused control in WinForms app? - Stack Overflow[^]
And you can then find the right cell for a DataGridView using the SelectedIndex and SelectedCells properties.