property 'Item' shadows an overloadable member declared in the base class 'DataRow'. If you want to overload the base method, this method must be declared 'Overloads'.

The TypedDataSetDesigner creates a Class for the DataRow inherited from DataRow class like

Partial Public Class SpDetRow
        Inherits Global.System.Data.DataRow

with a Property for each field of the DataBase with the Field name as follows:

<Global.System.Diagnostics.DebuggerNonUserCodeAttribute()> _
Public Property Name() As String
   Get
       Return CType(Me(Me.tableSpDet.NameColumn), String)
   End Get
   Set(ByVal value As String)
       Me(Me.tableSpDet.NameColumn) = value
   End Set
End Property

Similarly in the above case it has created a Property Item for the field Item of the Database.

But the base class DataRow has a property Item as explained here
http://msdn.microsoft.com/en-us/library/system.data.datarow.aspx#Y0[^] hence the above error may be thrown.

To avoid that error try renaming the Field name in the DataBase from Item to say SpDetItem and generated the typed DataSet again from the DataBase, so that the designer will generate the Property for SpDetItem instead of Item, so that the above conflict can be resolved.

I think it may be helpful.