How to include decimal point to string in vb.net?

Question

How to add decimal point (with two decimal places) to string, without converting string to decimal?

For example (Dim str1 as String), regardless str1 has value: 100 , 100.0 , 100.00, or 100.5 , 100.50... I'd like to get the output: 100.00 or 100.50, with two decimal places.

Answer 1

Public Function FormatNumber(ByVal s As String) As String
    Dim pos As Integer = s.IndexOf("."c)
    If pos = -1 Then ' No decimal point
        Return s & ".00"
    Else
        Return (s & "00").Substring(0, pos + 3)
    End If
End Function

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And since you inserted a C# tag:

public string FormatNumber(string s)
{
    int pos = s.IndexOf('.');
    if (pos == -1) { // No decimal point 
        return s + ".00";
    } else {
        return (s + "00").Substring(0, pos + 3);
    }
}

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However, note that superfluous decimals will be truncated - no rounding occurs!