Merge two or more datatables in asp.net using C# and VB.net

In this article I am going to explain how to merge two or more datatables in c# using C# and vb.net
Merge two or more datatables in asp.net using C# and VB.net


Description:
Merge method is use to merge 2 datatables objects. 

Implementation:

HTML Markup of webform:
   <table>
    <tr>
    <td> <asp:GridView ID="GridView1" runat="server"
            CellPadding="4" ForeColor="#333333" GridLines="None">
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
            <EditRowStyle BackColor="#999999" />
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#E9E7E2" />
            <SortedAscendingHeaderStyle BackColor="#506C8C" />
            <SortedDescendingCellStyle BackColor="#FFFDF8" />
            <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
        </asp:GridView></td> <td></td><td>   <asp:GridView ID="GridView2" runat="server"
            CellPadding="4" ForeColor="#333333" GridLines="None">
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
            <EditRowStyle BackColor="#999999" />
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#E9E7E2" />
            <SortedAscendingHeaderStyle BackColor="#506C8C" />
            <SortedDescendingCellStyle BackColor="#FFFDF8" />
            <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
        </asp:GridView></td>
       <td></td>
       <td> <asp:GridView ID="GridView3" runat="server"
            CellPadding="4" ForeColor="#333333" GridLines="None">
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
            <EditRowStyle BackColor="#999999" />
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#E9E7E2" />
            <SortedAscendingHeaderStyle BackColor="#506C8C" />
            <SortedDescendingCellStyle BackColor="#FFFDF8" />
            <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
        </asp:GridView></td>
    </tr>
    </table>      
    
        <asp:GridView ID="GridView4" runat="server"
            CellPadding="4" ForeColor="#333333" GridLines="None">
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
            <EditRowStyle BackColor="#999999" />
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#E9E7E2" />
            <SortedAscendingHeaderStyle BackColor="#506C8C" />
            <SortedDescendingCellStyle BackColor="#FFFDF8" />
            <SortedDescendingHeaderStyle BackColor="#6F8DAE" />
        </asp:GridView>

Import the namespce:
C# code:
using System.Data;

VB.net code:
Imports System.Data

Write the below code on code file:
C# code:

protected void Page_Load(object sender, EventArgs e)
    {
        BindGrid1();
        BindGrid2();
        BindGrid3();
        BindGrid4();
    }
    public DataTable DatatableOne()
    {
        DataTable dt = new DataTable();
        var colm = dt.Columns.Add("ID", typeof(int));
        dt.PrimaryKey = new DataColumn[] { colm };
        dt.Columns.Add("Name", typeof(string));
        dt.Columns.Add("Class", typeof(string));
        dt.Rows.Add(1, "John","12th");
        return dt;
    }

    public DataTable DatatableTwo()
    {
        DataTable dt = new DataTable();
        var colm = dt.Columns.Add("ID", typeof(int));
        dt.PrimaryKey = new DataColumn[] { colm };
        dt.Columns.Add("Roll Number", typeof(int));
        dt.Rows.Add(1, "123654");
        return dt;
    }
    public DataTable DatatableThree()
    {
        DataTable dt = new DataTable();
        var colm = dt.Columns.Add("ID", typeof(int));
        dt.PrimaryKey = new DataColumn[] { colm };
        dt.Columns.Add("Marks", typeof(int));
        dt.Rows.Add(1, "400");
        return dt;
    }
    public void BindGrid1()
    {
        GridView1.DataSource = DatatableOne();
        GridView1.DataBind();
    }
    public void BindGrid2()
    {
        GridView2.DataSource = DatatableTwo();
        GridView2.DataBind();
    }
    public void BindGrid3()
    {
        GridView3.DataSource = DatatableThree();
        GridView3.DataBind();
    }
    public DataTable MergeTables()
    {
        var tbl = DatatableOne();
        tbl.Merge(DatatableTwo());
        tbl.Merge(DatatableThree());
        return tbl;
    }
    public void BindGrid4()
    {
        GridView4.DataSource = MergeTables();
        GridView4.DataBind();
    }

VB.net code:
Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
        BindGrid1()
        BindGrid2()
        BindGrid3()
        BindGrid4()
    End Sub
    Public Function DatatableOne() As DataTable
        Dim dt As New DataTable()
        Dim colm = dt.Columns.Add("ID", GetType(Integer))
        dt.PrimaryKey = New DataColumn() {colm}
        dt.Columns.Add("Name", GetType(String))
        dt.Columns.Add("Class", GetType(String))
        dt.Rows.Add(1, "John", "12th")
        Return dt
    End Function
    Public Function DatatableTwo() As DataTable
        Dim dt As New DataTable()
        Dim colm = dt.Columns.Add("ID", GetType(Integer))
        dt.PrimaryKey = New DataColumn() {colm}
        dt.Columns.Add("Roll Number", GetType(Integer))
        dt.Rows.Add(1, "123654")
        Return dt
    End Function
    Public Function DatatableThree() As DataTable
        Dim dt As New DataTable()
        Dim colm = dt.Columns.Add("ID", GetType(Integer))
        dt.PrimaryKey = New DataColumn() {colm}
        dt.Columns.Add("Marks", GetType(Integer))
        dt.Rows.Add(1, "400")
        Return dt
    End Function
    Public Sub BindGrid1()
        GridView1.DataSource = DatatableOne()
        GridView1.DataBind()
    End Sub
    Public Sub BindGrid2()
        GridView2.DataSource = DatatableTwo()
        GridView2.DataBind()
    End Sub
    Public Sub BindGrid3()
        GridView3.DataSource = DatatableTwo()
        GridView3.DataBind()
    End Sub
    Public Function MergeTable() As DataTable
        Dim tbl = DatatableOne()
        tbl.Merge(DatatableTwo())
        tbl.Merge(DatatableThree())
        Return tbl
    End Function
    Public Sub BindGrid4()
        GridView4.DataSource = MergeTable()
        GridView4.DataBind()
    End Sub

Build and run the created  application.


  In this article we have learn how to merge two or more datatables in asp.net using C# and Vb.net. I hope you enjoyed this article. Please post you comment, query and feedback about this article. You can like me on Facebook, Google+, Linkedin and Twitter via hit on Follow us Button and also can get update follow by Email.  

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