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Public Function CheckLogin(ByVal username As String, ByVal password As String) As Boolean
Dim output As Boolean
Using connection As SqlConnection = New SqlConnection("your_connection_string")
Using cmd As SqlCommand = New SqlCommand("SELECT COUNT(*) FROM mstusers WHERE username = '" + username + "' AND password = '" + password + "'", connection)
Dim ret As Integer = cmd.ExecuteScalar()
output = ret.Equals(1)
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