I am fairly new to Winforms, and I would like to know how to use a MaskedTextBox to ensure that only numerical values(decimals included) are entered by the user.
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Why not just use a NumericUpDown? Set your max and min values, number of decimal places, and away you go.
http://msdn.microsoft.com/en-us/library/system.windows.forms.numericupdown%28v=vs.90%29.aspx