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Try to avoid posting auto generated part and explain what your posting.because there is no use pasting code with out explanation. this will be helpful for learners 

During development with GridView, we might come across many situations in which we need to extend GridView for our requirements. For example, we need to have a separate header other than the header provided by GridView.

In that case we need to add new GridView item of header type. In this article we will see how merge two or more columns.

protected void GridView_Merge_Header_RowCreated(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.Header)
    {
        //Build custom header.
        GridView oGridView = (GridView)sender;
        GridViewRow oGridViewRow = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert);
        TableCell oTableCell = new TableCell();
       
                //Add Department
                oTableCell.Text = "Department";
                oTableCell.ColumnSpan = 2;
                oGridViewRow.Cells.Add(oTableCell);

                //Add Employee
                oTableCell = new TableCell();
                oTableCell.Text = "Employee";
                oTableCell.ColumnSpan = 3;
                oGridViewRow.Cells.Add(oTableCell);
                oGridView.Controls[0].Controls.AddAt(0, oGridViewRow);
    }
}

Set DataSource from DataSet


using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;


public class Form1 : System.Windows.Forms.Form {
    const string strConnect = "data source=\".\";database='biblio';uid=\"admin\";pwd=pw";
    string strQuery = "Select Title, Price from Titles where Title like 'Hit%'";
    SqlConnection cn = new SqlConnection(strConnect); // = new SqlDataAdapter();
    DataSet ds = new DataSet();

    internal System.Windows.Forms.Button Button1;
    internal System.Windows.Forms.DataGrid DataGrid1;
    private System.Data.SqlClient.SqlDataAdapter da;

    public Form1() {
        this.Button1 = new System.Windows.Forms.Button();
        this.DataGrid1 = new System.Windows.Forms.DataGrid();
        this.da = new System.Data.SqlClient.SqlDataAdapter();
        ((System.ComponentModel.ISupportInitialize)(this.DataGrid1)).BeginInit();
        this.SuspendLayout();

        this.Button1.Location = new System.Drawing.Point(168, 266);
        this.Button1.Size = new System.Drawing.Size(96, 32);
        this.Button1.Text = "Get Data";
        this.Button1.Click += new System.EventHandler(this.Button1_Click);

        this.DataGrid1.DataMember = "";
        this.DataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
        this.DataGrid1.Location = new System.Drawing.Point(8, 18);
        this.DataGrid1.Size = new System.Drawing.Size(392, 232);

        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(408, 317);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.Button1,
                                                                          this.DataGrid1});
        this.Load += new System.EventHandler(this.Form1_Load);
        ((System.ComponentModel.ISupportInitialize)(this.DataGrid1)).EndInit();
        this.ResumeLayout(false);

    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
    private void Form1_Load(object sender, System.EventArgs e) {
        try {
            cn.Open();
            da.SelectCommand = new SqlCommand(strQuery, cn);
        } catch (SqlException ex) {
            Console.WriteLine(ex.ToString());
        }
    }

    private void Button1_Click(object sender, System.EventArgs e) {
        da.Fill(ds, "Titles and Price");
        DataGrid1.DataSource = ds.Tables["Titles and Price"];
    }
}

Set Data Binding with DataViewManager


using System;
using System.Configuration;
using System.Data;
using System.Data.Common;
using System.Data.SqlClient;
using System.Windows.Forms;

class Form1 : Form {
    public Form1() {
        InitializeComponent();
    }

    private void getData_Click(object sender, EventArgs e) {
        string orders = "SELECT * FROM Orders";
        string customers = "SELECT * FROM Customers";

        using (SqlConnection con = new SqlConnection(ConfigurationSettings.ConnectionStrings["northwind"].ConnectionString)) {

            SqlDataAdapter da = new SqlDataAdapter(orders, con);

            DataSet ds = new DataSet();

            da.Fill(ds, "Orders");

            da = new SqlDataAdapter(customers, con);

            da.Fill(ds, "Customers");

            ds.Relations.Add("CustomerOrders",
                ds.Tables["Customers"].Columns["CustomerID"],
                ds.Tables["Orders"].Columns["CustomerID"]);

            DataViewManager dvm = new DataViewManager(ds);

            dvm.DataViewSettings["Customers"].RowFilter = "Country='UK'";

            dataGrid.SetDataBinding(dvm, "Customers");

        }

    }
    private void InitializeComponent() {
        this.getData = new System.Windows.Forms.Button();
        this.dataGrid = new System.Windows.Forms.DataGrid();
        this.SuspendLayout();
        //
        // getData
        //
        this.getData.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
        this.getData.Location = new System.Drawing.Point(684, 558);
        this.getData.Name = "getData";
        this.getData.TabIndex = 0;
        this.getData.Text = "Get Data";
        this.getData.Click += new System.EventHandler(this.getData_Click);
        //
        // dataGrid
        //
        this.dataGrid.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                    | System.Windows.Forms.AnchorStyles.Left)
                    | System.Windows.Forms.AnchorStyles.Right)));
        this.dataGrid.Location = new System.Drawing.Point(13, 13);
        this.dataGrid.Name = "dataGrid";
        this.dataGrid.Size = new System.Drawing.Size(745, 534);
        this.dataGrid.TabIndex = 1;
        //
        // Form1
        //
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(771, 593);
        this.Controls.Add(this.dataGrid);
        this.Controls.Add(this.getData);
        this.Name = "Form1";
        this.Text = "Form1";
        this.ResumeLayout(false);

    }



    private System.Windows.Forms.Button getData;
    private System.Windows.Forms.DataGrid dataGrid;

    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.Run(new Form1());
    }
}

Bind related tables



using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Configuration;
using System.Data.SqlClient;

public class Form1 : Form {
    public Form1() {
        InitializeComponent();
    }

    private void getData_Click(object sender, EventArgs e) {
        string orders = "SELECT * FROM Orders";
        string customers = "SELECT * FROM Customers";

        using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["northwind"].ConnectionString)) {
            DataSet ds = new DataSet();

            SqlDataAdapter da = new SqlDataAdapter(customers, con);
            da.Fill(ds, "Customers");

            da = new SqlDataAdapter(orders, con);
            da.Fill(ds, "Orders");

            ds.Relations.Add("CustomerOrders",
                ds.Tables["Customers"].Columns["CustomerID"],
                ds.Tables["Orders"].Columns["CustomerID"]);

            dataGrid1.SetDataBinding(ds, "Customers");
        }
    }
    private void InitializeComponent() {
        this.getData = new System.Windows.Forms.Button();
        this.dataGrid1 = new System.Windows.Forms.DataGrid();
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
        this.SuspendLayout();

        this.getData.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
        this.getData.Location = new System.Drawing.Point(316, 299);
        this.getData.Name = "getData";
        this.getData.Size = new System.Drawing.Size(75, 23);
        this.getData.TabIndex = 1;
        this.getData.Text = "Get Data";
        this.getData.UseVisualStyleBackColor = true;
        this.getData.Click += new System.EventHandler(this.getData_Click);

        this.dataGrid1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                    | System.Windows.Forms.AnchorStyles.Left)
                    | System.Windows.Forms.AnchorStyles.Right)));
        this.dataGrid1.DataMember = "";
        this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
        this.dataGrid1.Location = new System.Drawing.Point(12, 12);
        this.dataGrid1.Size = new System.Drawing.Size(379, 281);
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(403, 334);
        this.Controls.Add(this.dataGrid1);
        this.Controls.Add(this.getData);
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
        this.ResumeLayout(false);
    }
    private System.Windows.Forms.Button getData;
    private System.Windows.Forms.DataGrid dataGrid1;
    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
    }
}
           

Set SelectCommand


using System;
using System.Diagnostics;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

public class Form1 : System.Windows.Forms.Form {
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.TextBox txtStateWanted;
    private System.Windows.Forms.Button btnFind;
    private System.Windows.Forms.DataGrid dataGrid1;
    public Form1() {
        this.label1 = new System.Windows.Forms.Label();
        this.txtStateWanted = new System.Windows.Forms.TextBox();
        this.btnFind = new System.Windows.Forms.Button();
        this.dataGrid1 = new System.Windows.Forms.DataGrid();
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
        this.SuspendLayout();

        this.label1.Location = new System.Drawing.Point(62, 241);
        this.label1.Size = new System.Drawing.Size(32, 23);
        this.label1.Text = "State";

        this.txtStateWanted.Location = new System.Drawing.Point(102, 241);
        this.txtStateWanted.Size = new System.Drawing.Size(64, 20);
        this.txtStateWanted.Text = "CA";

        this.btnFind.Location = new System.Drawing.Point(206, 241);
        this.btnFind.Text = "Fill";
        this.btnFind.Click += new System.EventHandler(this.btnFind_Click);

        this.dataGrid1.DataMember = "";
        this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
        this.dataGrid1.Location = new System.Drawing.Point(6, 9);
        this.dataGrid1.Size = new System.Drawing.Size(280, 224);

        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(292, 273);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.label1,
                                                                          this.txtStateWanted,
                                                                          this.btnFind,
                                                                          this.dataGrid1});
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
        this.ResumeLayout(false);

    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }

    private void btnFind_Click(object sender, System.EventArgs e) {
        try {
            DataSet ds = new DataSet();
            SqlDataAdapter da = new SqlDataAdapter("SELECT pubid, pubname, city, state FROM publishers where state = @State", "data source=.;database=biblio;uid=admin;pwd=pw");

            da.SelectCommand.Parameters.Add("@State", txtStateWanted.Text);
            da.Fill(ds, "PublishersIn" + txtStateWanted.Text);
            dataGrid1.DataSource = ds.Tables[0];
        } catch (SqlException sex) {
            Debug.WriteLine(sex.ToString());
        }
    }
}

using System;
using System.Diagnostics;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

public class Form1 : System.Windows.Forms.Form {
    internal System.Windows.Forms.DataGrid DataGrid1;
    internal System.Windows.Forms.Button btnRunQuery;
    private System.Windows.Forms.Button btnRunQuery2;
    public Form1() {
        this.DataGrid1 = new System.Windows.Forms.DataGrid();
        this.btnRunQuery = new System.Windows.Forms.Button();
        this.btnRunQuery2 = new System.Windows.Forms.Button();
        ((System.ComponentModel.ISupportInitialize)(this.DataGrid1)).BeginInit();
        this.SuspendLayout();

        this.DataGrid1.DataMember = "";
        this.DataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
        this.DataGrid1.Location = new System.Drawing.Point(8, ;
        this.DataGrid1.Size = new System.Drawing.Size(280, 200);

        this.btnRunQuery.Location = new System.Drawing.Point(8, 224);
        this.btnRunQuery.Size = new System.Drawing.Size(80, 24);
        this.btnRunQuery.Text = "Run Query 1";
        this.btnRunQuery.Click += new System.EventHandler(this.btnRunQuery_Click);

        this.btnRunQuery2.Location = new System.Drawing.Point(104, 224);
        this.btnRunQuery2.Size = new System.Drawing.Size(80, 24);
        this.btnRunQuery2.Text = "Run Query 2";
        this.btnRunQuery2.Click += new System.EventHandler(this.btnRunQuery2_Click);

        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(292, 273);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.btnRunQuery2,
                                                                          this.DataGrid1,
                                                                          this.btnRunQuery});
        ((System.ComponentModel.ISupportInitialize)(this.DataGrid1)).EndInit();
        this.ResumeLayout(false);

    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }

    private void btnRunQuery_Click(object sender, System.EventArgs e) {
        try {
            SqlConnection cn = new SqlConnection("data source=.;database=biblio;uid=admin;pwd=pw");

            SqlDataAdapter da = new SqlDataAdapter("Select top 50 Author, Year_born from Authors Where Year_born is not null", cn);

            DataSet ds = new DataSet();

            da.Fill(ds, "Authors");

            DataGrid1.DataSource = ds.Tables["Authors"];
        } catch (SqlException ex) {
            Debug.WriteLine(ex.ToString());
        }
    }

    private void btnRunQuery2_Click(object sender, System.EventArgs e) {
        try {
            SqlConnection cn = new SqlConnection("data source=.;database=biblio;uid=admin;pwd=pw");

            SqlDataAdapter da = new SqlDataAdapter("Select Title, Price from Titles where Title like 'Hit%'", cn);

            DataSet ds = new DataSet();

            da.Fill(ds, "Titles and Price");

            DataGrid1.DataSource = ds.Tables["Titles and Price"];
        } catch (SqlException ex) {
            Debug.WriteLine(ex.ToString());
        }
    }

}