Button2.Visible = false; // to hide button
textBox1.Visible = false; // to hide textbox
 
Button2.Visible = true; // to show button
textBox1.Visible = false; // to show textbox

		<asp:DataGrid ID="dgprodlist" Runat="server" AutoGenerateColumns="False">
			<Columns>
				<asp:BoundColumn HeaderText="Product" DataField="Product"></asp:BoundColumn>
				<asp:TemplateColumn>
					<ItemTemplate>
						<asp:TextBox ID="txtText" Runat="server"></asp:TextBox>
						&nbsp;
						<asp:Button ID="btnButton" Runat="server" Text="Button"></asp:Button>
					</ItemTemplate>
				</asp:TemplateColumn>
 
			</Columns>
		</asp:DataGrid>

	public class itinerary : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DataGrid dgprodlist;
 
		//set up some data
		private string[] products = {"Product 1","Product 2","Hotel Booking"};
		private DataTable prodList = new DataTable();
 
		private void Page_Load(object sender, System.EventArgs e)
		{
			// Put user code to initialize the page here
			if(!IsPostBack)
			{
				//Add a column (I don't have your database so I have to mock it up)
				prodList.Columns.Add("Product");
 
				//add some rows
				for(int i = 0; i < 3; ++i)
				{
					DataRow row = prodList.NewRow();
					row[0] = products[i];
					prodList.Rows.Add(row);
				}
 
				//Bind the data
				dgprodlist.DataSource = prodList;
				dgprodlist.DataBind();
 
			}
		}
 
		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
 
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);
			this.dgprodlist.ItemDataBound += new DataGridItemEventHandler(dgprodlist_ItemDataBound); //Wire up the event. Fires on row creation during DataBind()
		}
		#endregion
 
		private void dgprodlist_ItemDataBound(object sender, DataGridItemEventArgs e)
		{
			//Test for rows, don't want to execute code on header item that will cause an exception.
			if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
			{
				//Get a reference to the textbox and button control
				TextBox tb = (TextBox)e.Item.Cells[1].FindControl("txtText");
				Button b = (Button)e.Item.Cells[1].FindControl("btnButton");
 
				//If it's the hotel booing product show the controls, else hide them
				if(e.Item.Cells[0].Text == "Hotel Booking")
				{
					tb.Visible = true;
					b.Visible = true;
				}
				else
				{
					tb.Visible = false;
					b.Visible = false;
				}
			}
		}
	}

protected void Page_Load()
{
int id = int.Parse(Request.QueryString["ID"]);
 
if (id == "hotel booking") //etc...
{
TextBox1.Visible = true;
Button1.Visible = true;
}
else
{
TextBox1.Visible = false;
Button1.Visible = false;
}