SQL Database new row won't save

[ghall426]

I have the following code. When I add a new row, it adds it to the dataset in memory but never updates the database on the hard drive. What am I doing wrong?

myCon = New SqlConnection("Data Source=.\SQLEXPRESS..........)
myDA = New SqlDataAdapter("SELECT * FROM Rescue", myCon)
myDA.TableMappings.Add("Table", "Rescue")
myDS = New DataSet
myDA.Fill(myDS)
 
Dim myRow As DataRow = myDS.Tables("Rescue").NewRow
myRow.Item("CallNum") = Me.TxtCallNum.Text
myRow.Item("TimeCall") = Me.TxtTimeCall.Text
myDS.Tables("Rescue").Rows.Add(myRow)
myDA.Update(myDS)