//include all the required namespaces

using System;  
using System.Drawing;  
using System.Collections;  
using System.ComponentModel;  
using System.Windows.Forms;  
using System.Data;  
using System.Text;  
using System.Xml;  
  
namespace Test  
{
                
public class TestDataGrid : System.Windows.Forms 
{
    /// <summary> 
      /// Required designer variable. 
      /// </summary>   
      private System.Windows.Forms.ComboBox cmbFunctionArea;
      private DataTable                     dtblFunctionalArea;
      private DataGrid                      dgdFunctionArea;
}
/// <summary>  
/// public constructor 
/// </summary>  

public frmInitialShortListing()  
{  
      //automatically generated by the VS Designer  
      //creates the object of the above designer variables  
      InitializeComponent();
      PopulateGrid();  
}

private void PopulateGrid()
{
      //Declare and initialize local variables used
      DataColumn dtCol = null;//Data Column variable
      string[]   arrstrFunctionalArea = null;//string array variable
      System.Windows.Forms.ComboBox cmbFunctionArea;  //combo box var              
      DataTable dtblFunctionalArea;//Data Table var
           
      //Create the combo box object and set its properties
      cmbFunctionArea               = new ComboBox();
      cmbFunctionArea.Cursor        = System.Windows.Forms.Cursors.Arrow;
      cmbFunctionArea.DropDownStyle=System.Windows.Forms.ComboBoxStyle.DropDownList;
      cmbFunctionArea.Dock          = DockStyle.Fill;
      //Event that will be fired when selected index in the combo box is changed
      cmbFunctionArea.SelectionChangeCommitted += new   EventHandlercmbFunctionArea_SelectedIndexChanged);
     
      //Create the String array object, initialize the array with the column
      //names to be displayed
      arrstrFunctionalArea          = new string [3];
      arrstrFunctionalArea[0]       = "Functional Area";
      arrstrFunctionalArea[1]       = "Min";
      arrstrFunctionalArea[2]       = "Max";
     
      //Create the Data Table object which will then be used to hold
      //columns and rows
      dtblFunctionalArea            = new DataTable ("FunctionArea");
      //Add the string array of columns to the DataColumn object       
      for(int i=0; i< 3;i++)
      {    
            string str        = arrstrFunctionalArea[i];
            dtCol             = new DataColumn(str);
            dtCol.DataType          = System.Type.GetType("System.String");
            dtCol.DefaultValue      = "";
            dtblFunctionalArea.Columns.Add(dtCol);               
      }     

      //Add a Column with checkbox at last in the Grid     
      DataColumn dtcCheck    = new DataColumn("IsMandatory");//create the data          //column object with the name 
      dtcCheck.DataType      = System.Type.GetType("System.Boolean");//Set its //data Type
      dtcCheck.DefaultValue  = false;//Set the default value
      dtblFunctionalArea.Columns.Add(dtcCheck);//Add the above column to the //Data Table
  
      //Set the Data Grid Source as the Data Table createed above
      dgdFunctionArea.DataSource    = dtblFunctionalArea; 

//set style property when first time the grid loads, next time onwards it //will maintain its property
if(!dgdFunctionArea.TableStyles.Contains("FunctionArea"))
{
            //Create a DataGridTableStyle object     
            DataGridTableStyle dgdtblStyle      = new DataGridTableStyle();
            //Set its properties
            dgdtblStyle.MappingName            = dtblFunctionalArea.TableName;//its table name of dataset
            dgdFunctionArea.TableStyles.Add(dgdtblStyle);
            dgdtblStyle.RowHeadersVisible       = false;
            dgdtblStyle.HeaderBackColor         = Color.LightSteelBlue;
            dgdtblStyle.AllowSorting            = false;
            dgdtblStyle.HeaderBackColor         = Color.FromArgb(8,36,107);
            dgdtblStyle.RowHeadersVisible       = false;
            dgdtblStyle.HeaderForeColor         = Color.White;
            dgdtblStyle.HeaderFont              = new System.Drawing.Font("Microsoft Sans Serif", 9F,  
                System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
            dgdtblStyle.GridLineColor           = Color.DarkGray;
            dgdtblStyle.PreferredRowHeight            = 22;
            dgdFunctionArea.BackgroundColor           = Color.White; 

//Take the columns in a GridColumnStylesCollection object and set //the size of the
            //individual columns   
            GridColumnStylesCollection    colStyle;
colStyle                = dgdFunctionArea.TableStyles[0].GridColumnStyles;
            colStyle[0].Width             = 100;
            colStyle[1].Width       = 50;
            colStyle[2].Width       = 50;
            colStyle[3].Width       = 80;
}

  //To add the combo box dynamically to the data grid, you have to take the // Text Box that is present (by default) in the column where u want to add //this combo box (here it is first column i.e. Functional Area).From the //tablestyles of the data grid take the grid column styles of the column //where you want to add the combo box respectively.

            DataGridTextBoxColumn dgtb    =     (DataGridTextBoxColumn)dgdFunctionArea.TableStyles[0].GridColumnStyles[0];

      //Add the combo box to the text box taken in the above step 
      dgtb.TextBox.Controls.Add (cmbFunctionArea);        

Note:-//After these add the code to fill the details in the grid by //establishing
      // connection to the server and writing necessary steps: 

  }//end of the class

}//end of the namespace

//call this below method after initialize component  
private void PopulateShortlistGrid()  
{ 
DataColumn        dtcShortlist;
//Combo box control added as discussed above     
cmbWorkflow                   = new ComboBox(); 
cmbWorkflow.Cursor            = System.Windows.Forms.Cursors.Arrow; 
cmbWorkflow.DropDownStyle     = System.Windows.Forms.ComboBoxStyle.DropDownList;  
cmbWorkflow.Dock              = DockStyle.Fill;  
dtbShortlist                  = new DataTable("ShortList");  
string strColumnName          = null; 
string []arrstrSearch         = null;  
arrstrSearch                  = new string[4];  
arrstrSearch[1]               = "Candidate Code";  
arrstrSearch[2]               = "Candidate Name";
arrstrSearch[3]               = "Workflow"; 
 //Adding a check box control in the first column of the data grid  
//create a Data Column object with Column Name as “Select”   
DataColumn  dtcCheck          = new DataColumn("Select");  
//Set the data type of the checkbox i.e. to Boolean  
dtcCheck.DataType             = System.Type.GetType("System.Boolean");  
//Set its default value as false  
dtcCheck.DefaultValue         = false;  
//add the above check box column to the data table  
dtbShortlist.Columns.Add(dtcCheck);  
//Also add the other three columns i.e. Candidate Code, Candidate //Name and Workflow respectively  
for(int intI=1; intI< 4;intI++)  
{   
strColumnName     = arrstrSearch[intI]; 
dtcShortlist      = new DataColumn(strColumnName); 
dtcShortlist.DataType = System.Type.GetType("System.String");   
dtbShortlist.Columns.Add(dtcShortlist);
}  
dgdShortList.DataSource       = dtbShortlist; 
}