<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
            DataSourceMode="DataSet"
            DeleteCommand="DELETE FROM sprclient where sprclient.id='@ID'"
            UpdateCommand="UPDATE SPRCLIENT WHERE SPRCLIENT.ID='@ID' SET SPRCLIENT.FULLNAME='@FULLNAME',SPRCLIENT.INN='@INN',SPRCLIENT.ADRESS1='@ADRESS1'"
            InsertCommand="INSERT INTO SPRCLIENT (FULLNAME,INN,ADRESS1) VALUES ('@FULLNAME,'@INN','@ADRESS1')"
            ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>" SelectCommand="SELECT id, fullname, inn, adress1 FROM sprclient ORDER BY fullname">
        </asp:SqlDataSource>
        <asp:Label ID="Label1" runat="server" Text="Label" Width="755px"></asp:Label>
        <asp:Panel ID="Panel1" runat="server" Height="636px" ScrollBars="Auto" Width="756px">
            <asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" Height="626px"
                Width="729px" DataKeyNames="ID" AllowPaging="True" AutoGenerateColumns="False" PageSize="20" OnRowUpdating="GridView1_RowUpdating">
                <Columns>
                    <asp:BoundField DataField="INN" HeaderText="ИНН" >
                        <HeaderStyle BackColor="Gray" />
                    </asp:BoundField>
                    <asp:BoundField DataField="FULLNAME" HeaderText="Название" >
                        <HeaderStyle BackColor="Gray" />
                    </asp:BoundField>
                    <asp:BoundField DataField="ADRESS1" HeaderText="Адрес" >
                        <HeaderStyle BackColor="Gray" />
                    </asp:BoundField>
                    <asp:CommandField ButtonType="Button" CancelText="Отмена" DeleteText="Удал" EditText="Изм"
                        ShowEditButton="True" HeaderText="Редактирование" >
                        <HeaderStyle BackColor="Gray" />
                    </asp:CommandField>
                </Columns>
            </asp:GridView>
        </asp:Panel>

        <asp:ObjectDataSource ID="ObjDataSource1" runat="server" TypeName="sprclient" SelectMethod="Select" UpdateMethod="Update">
            <UpdateParameters>
                <asp:ControlParameter ControlID="HiddenField1" Name="ID" PropertyName="Value" />
                <asp:ControlParameter ControlID="TextBox1" Name="FULLNAME" PropertyName="Text" />
                <asp:ControlParameter ControlID="TextBox2" Name="INN" PropertyName="Text" />
                <asp:ControlParameter ControlID="TextBox3" Name="ADRESS1" PropertyName="Text" />
            </UpdateParameters>
        </asp:ObjectDataSource>
        <asp:HiddenField ID="HiddenField1" runat="server" />
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="Button" />
        <asp:Panel ID="Panel1" runat="server" Height="636px" ScrollBars="Auto" Width="756px">
            <asp:GridView ID="GridView1" runat="server" DataSourceID="ObjDataSource1" Height="626px"
                Width="717px" DataKeyNames="ID" AllowPaging="True" AutoGenerateColumns="False" PageSize="20" OnRowUpdating="GridView1_RowUpdating">
                <Columns>
                    <asp:BoundField DataField="INN" HeaderText="ИНН" >
                        <HeaderStyle BackColor="Gray" />
                    </asp:BoundField>
                    <asp:BoundField DataField="FULLNAME" HeaderText="Название" >
                        <HeaderStyle BackColor="Gray" />
                    </asp:BoundField>
                    <asp:BoundField DataField="ADRESS1" HeaderText="Адрес" >
                        <HeaderStyle BackColor="Gray" />
                    </asp:BoundField>
                    <asp:CommandField ButtonType="Button" CancelText="Отмена" DeleteText="Удал" EditText="Изм"
                        ShowEditButton="True" HeaderText="Редактирование" >
                        <HeaderStyle BackColor="Gray" />
                    </asp:CommandField>
                </Columns>
                <EditRowStyle BackColor="Teal" />
                <AlternatingRowStyle BackColor="#E0E0E0" />
            </asp:GridView>
        </asp:Panel>

    public partial class _Default : System.Web.UI.Page
    {
        protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            HiddenField1.Value = GridView1.DataKeys[e.RowIndex].Value.ToString();
            TextBox1.Text = GridView1.Rows[e.RowIndex].Cells[ 0 ].Text;
            TextBox2.Text = GridView1.Rows[e.RowIndex].Cells[ 1 ].Text;
            TextBox3.Text = GridView1.Rows[e.RowIndex].Cells[ 2 ].Text;
        }
     }

    public class sprclient
    {
        protected OleDbDataAdapter vfpDA;
        protected DataSet DS;
        public sprclient()
        {
            vfpDA = new OleDbDataAdapter("SELECT id, fullname, inn, adress1 FROM SPRCLIENT", ConfigurationManager.ConnectionStrings["ConnectionString"].ToString());
        }
        public DataSet Select()
        {
            DS = new DataSet();
            vfpDA.Fill(DS);
            return DS;
        }
        public void Update(string ID, string INN, string FULLNAME, string ADRESS1)
        {
        }
    }

        public void Update(string ID, string INN, string FULLNAME, string ADRESS1)
        {
            OleDbCommandBuilder CommandBuilder = new OleDbCommandBuilder(vfpDA);
            // тут ошибка
            vfpDA.UpdateCommand = CommandBuilder.GetUpdateCommand();
            vfpDA.Update(DS, DS.Tables[ 0 ].ToString());
        }