How to store list(of fmd) in a string?

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VB

MySQL

Hello. Sorry i am new in vb.net and in making codes, i am trying to create DTR so i start studying the sample project of UareU. I have read the codes and try it by running the app. I understand all codes but there is one thing i want to know, i have this code from the sample subject:

Private frstFinger As Fmd = Nothing

Private ffs1 As String

...
...
...

frstFinger = resultConversion.Data

ffs1 = Fmd.SerializeXml(frstFinger)

this lines work perfectly, what i want is to save data into a string like this:

Private frstFinger As List(of Fmd)

Private ffs1 As String

...
...
...

frstFinger = resultConversion.Data

ffs1 = Fmd.SerializeXml(frstFinger)'this line says "Value of type 'System.Collections.Generic.List(Of DPUruNet.Fmd)' cannot be converted to 'DPUruNet.Fmd'."

Is there anyway to save the data into a string from List(of fmd)? I just want it so that the employee will scan several times and store it as a single template. Thanks in advance.

What I have tried:

I have tried to make it so that the employee will scan their finger several times in registering.