Searching a text file for a specific string

I want to use stream reader to search through each line of text for a specific value such as "Name" because it's locating a username.So far I have

Dim EmployeeFile As String = "C:\Users\Aizen\Desktop\ComputingSolution\SADS Solution\Resources\Files\Employees.txt"
        Dim Reader As New System.IO.StreamReader(EmployeeFile)
        FilePassword = Reader.ReadLine(Txt_Password.Text)
        FileUsername = Reader.ReadLine(Txt_Username.Text)