How to convert textbox input to decimal in VB.NET?

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VB

Hello, and I'm making a program that changes the value of some registry keys and the value needs to be exclusively Decimal format. How would I go about doing this?

Shared Sub SetColorizationColor(ByVal color As String)
    Dim regKey As RegistryKey
    regKey = My.Computer.Registry.CurrentUser.OpenSubKey("Software\Microsoft\Windows\DWM", True)
    regKey.SetValue("AccentColor", 268435455)
    regKey.SetValue("ColorizationColor", Convert.ToDecimal(color))
    regKey.Close()
End Sub

The argument "color" in this instance is the textbox input. The function is taking the textbox input (a string) and converts it to a decimal and sets a registry key value to the returned decimal.

This spits out an exception upon being called, saying:

Quote:

Input string was not in a correct format.

What I have tried:

I've tried using the Decimal.Parse() method. No luck at all. I've tried seeing if the key takes another format, and it hasn't worked either.

Thank you for the help in advance!