移除GridView中的重复项

1. The HTML Markup

  <div>

            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White">

                <Columns>

                    <asp:BoundField DataField="Id" HeaderText="Id" ItemStyle-Width="30" />

                    <asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="150" />

                    <asp:BoundField DataField="City" HeaderText="City" ItemStyle-Width="150" />

                </Columns>

            </asp:GridView>

            <br />

            <asp:Button ID="btnRemove" runat="server" Text="Remove Duplicates" OnClick="btnRemove_Click" />

        </div>

 2. 绑定GridView的方法

 public void BindGridview()

        {

            DataTable dt = new DataTable();

            dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id"), new DataColumn("Name"), new DataColumn("City") });

            dt.Rows.Add(1, "John Hammond", "United States");

            dt.Rows.Add(1, "John Hammond", "United States");

            dt.Rows.Add(2, "Mudassar Khan", "India");

            dt.Rows.Add(2, "Mudassar Khan", "India");

            dt.Rows.Add(3, "Suzanne Mathews", "France");

            dt.Rows.Add(3, "Suzanne Mathews", "France");

            dt.Rows.Add(3, "Suzanne Mathews", "France");

            dt.Rows.Add(4, "Robert Schidner", "Russia");

            dt.Rows.Add(4, "Robert Schidner", "Russia");

            dt.Rows.Add(4, "Robert Schidner", "Russia");

            dt.Rows.Add(4, "Robert Schidner", "Russia");



            ViewState["dt"] = dt;

            GridView1.DataSource = dt;

            GridView1.DataBind();

        }

       

 3. 移除重复项的方法

 public void RemoveDuplicateReords()

        {

            DataTable dt = (DataTable)ViewState["dt"];

            dt = dt.DefaultView.ToTable(true, "Id", "Name", "City");

            GridView1.DataSource = dt;

            GridView1.DataBind();

        }

 更多的详细信息，请访问下面的链接

http://www.aspsnippets.com/Articles/Remove-Delete-Duplicate-Rows-Records-from-DataTable-using-C-and-VBNet.aspx