VB.NET SQL problem

I'm attempting to retrieve an integer from a table using the below VB.NET snippet, but I'm getting an "Input string was not in a correct format" error.  MyInt is not null, so that's not the problem.  What am I doing wrong?

Dim MyInt As Integer
Dim conn = CreateObject("ADODB.Connection")
conn.Open("driver={SQL Server};server=(local);uid=MyUid;pwd=MyPwd;database=MyDatabase")

Dim rs = conn.Execute("SELECT MyInt FROM MyTable")
If Not rs.EOF Then
  MyInt = CInt(rs("MyInt").ToString)
End If
rs.close()
conn.Close()