How to Remove the Duplicate Rows from Data Table on the Behalf of Particular Column.
In this Example, I am Removing the Duplicate Rows From DataTable "dt" according to the Field "Country"Lets have a look.........
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GridView2.aspx.cs"
Inherits="GridViewSorting2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GrdDetails" runat="server" CellPadding="4" ForeColor="#333333"
GridLines="None" AutoGenerateColumns="false" >
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lbl_country" runat="server" Text='<%#Eval("Country") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<AlternatingRowStyle BackColor="White" />
<EditRowStyle BackColor="#2461BF" />
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#EFF3FB" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#F5F7FB" />
<SortedAscendingHeaderStyle BackColor="#6D95E1" />
<SortedDescendingCellStyle BackColor="#E9EBEF" />
<SortedDescendingHeaderStyle BackColor="#4870BE" />
</asp:GridView>
<br />
<br />
<asp:Button ID="btn_RemoveDuplicateResults" runat="server" Text="Remove Duplicate Results"
OnClick="btn_RemoveDuplicateResults_Click" />
</div>
</form>
</body>
</html>
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=========================
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Collections;
public partial class GridView2 : System.Web.UI.Page
{
DataTable dt = new DataTable();
protected void Page_Load(object sender, EventArgs e)
{
DataColumn col;
DataRow row1;
col = new DataColumn();
col.ColumnName = "Country";
col.DataType = System.Type.GetType("System.String");
dt.Columns.Add(col);
for (int i = 0; i < 2; i++)
{
row1 = dt.NewRow();
row1["Country"] = "Delhi";
dt.Rows.Add(row1);
}
for (int i = 0; i < 1; i++)
{
row1 = dt.NewRow();
row1["Country"] = "Mumbai";
dt.Rows.Add(row1);
}
for (int i = 0; i < 5; i++)
{
row1 = dt.NewRow();
row1["Country"] = "kolkata";
dt.Rows.Add(row1);
}
BindGridview();
}
public void BindGridview()
{
GrdDetails.DataSource = dt;
GrdDetails.DataBind();
}
protected void btn_RemoveDuplicateResults_Click(object sender, EventArgs e)
{
Hashtable hTable = new Hashtable();
ArrayList duplicateList = new ArrayList();
//Add list of all the unique item value to hashtable, which stores combination of key, value pair.
//And add duplicate item value in arraylist.
foreach (DataRow drow in dt.Rows)
{
if (hTable.Contains(drow["Country"]))
duplicateList.Add(drow);
else
hTable.Add(drow["Country"], string.Empty);
}
//Removing a list of duplicate items from datatable.
foreach (DataRow dRow in duplicateList)
dt.Rows.Remove(dRow);
//Datatable which contains unique records will be return as output.
DataTable dt22 = dt.Copy();
BindGridview()
}
}
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