ADO.NET :: Setting Value In Column?

I em trying the change the values of all numbers to o in a column calld QuP in a table called Segments with no positive results. The same query works ok testing in SQL

Dim sSql0 As
String = "update Segments set QuP = 0"
Dim oconn As SqlConnection
Dim ocmd As SqlCommand
try
oconn = New SqlConnection(oseriDB.GetConnectionString) ' the connection string is working right
ocmd = New SqlCommand(sSql0, oconn)
oconn.Open()
oconn.Close()
oconn = nothing
Catch ex
As Exception
lblmsg.Text = ex.Message
End try