Cannot access non-shared function in shared context

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VB

I have a public function that gets called from another class. As such the function needs to be shared in order for it to be called. However, when I make it shared, the connection string throws the exception Cannot access non-shared function GetConnection() in shared context. The function is ...

Public Shared Function GetUsernames() As Object
     Dim cmdUsernames As SqlCommand = New SqlCommand("crc_GetUsernameForAccountNoChangesMadeReport", CType(GetConnection(), SqlConnection))
     Dim user As String

     cmdUsernames.CommandType = CommandType.StoredProcedure
     With cmdUsernames
         .Connection.Open()
         Dim results As New List(Of Usernames)()
         Using reader As SqlDataReader = .ExecuteReader()
             While reader.Read()
                 user = reader.GetString(0)
                 Dim item As New Usernames() With {.Name = user}
                 results.Add(item)
             End While
             reader.Close()
             .Connection.Close()
             Return results
         End Using
     End With
 End Function

This function gets called from a form with the following code...

Private Sub frmAcctNoChgsMadeFilters_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
     Dim Users As List(Of Usernames) = GetUsernames()
     cboUsername.DataSource = Users
     cboUsername.ValueMember = "Name"
     cboUsername.DisplayMember = "Name"
 End Sub

How can I resolve this error