Decimal value issue

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C#

Hi, I have a textbox and the functionality of this textbox should be as follows.
If I enter 5, result should take the value as 5.00
If I enter 5.1, result should take the value as 5.10
similarly
for 5.123-5.12
5.12.3-5.12
5.1.2-5.10

I hope you understand the question and will reply soon...