What are the Different Ways to Send Data Across Pages in ASP.NET

Question

Hi What are the different ways to send data across pages in ASP.NET ?

Satyapriya Nayak · Answer

Hi Arun, There are various ways to pass data information across pages. 1. Cookies A small piece of information or message sent by the web server to web browser during a web request, which is stored on user's system in the form of a text file. Using a Cookie HttpCookie UserCookie = new HttpCookie ( "User" ); UserCookie.Value = txtName.Text; UserCookie.Expires = DateTime .Now.AddHours(1); Response.Cookies.Add(UserCookie); Retrieving a Cookie value lblMsg.Text = Request.Cookies[ "User" ].Value; 2. QueryString This is another way to pass data between pages using URL. e.g.: http://www.c-sharpcorner.com/Notification/Notification.aspx ?Mode=out The section beyond part marked in red is where the query string starts, using a question mark (?) as separator. Using "&" we can pass multiple query strings. Using a Query String Response.Redirect( String .Format( "RetrieveData.aspx?user={0}&id={1}" , txtName.Text, 1)); Retrieving a Query String value if (Request.QueryString[ "user" ] != null ) { lbl2.Text = Request.QueryString[ "user" ]; } 3 . Sessions The most acceptable and secure method is by using Session variables. Using a Session Session[ "user" ] = txtName.Text; Session[ "id" ] = 1; List string > colors = new List string >(); colors.Add( "red" ); colors.Add( "green" ); colors.Add( "blue" ); Session[ "colors" ] = colors; colors = null ; Response.Redirect( "RetrieveData.aspx" ); Retrieving a Session value if (Session[ "user" ] != null ) { lbl3.Text = Session[ "user" ].ToString(); } if (Session[ "colors" ] != null ) { List string > col = new List string >(); col = ( List string >) Session[ "colors" ]; foreach ( var item in col) { lbl3.Text += " " + item + ", " ; } col = null ; } 4. Cross-Page Posting Another technique used to post from one page to another page is by setting the PostBackUrl property to the target page . The PreviousPage property in the target page contains a reference to the source page. Using Cross-Page Posting asp : Button ID ="btnPage2" Text ="Call Page2" runat ="server" width ="132px" PostBackUrl ="~/RetrieveData.aspx" /> Retrieving a Cross-Page Posting value if (Page.PreviousPage != null ) { DropDownList ddl = ( DropDownList )Page.PreviousPage.FindControl( "ddl1" ); if (ddl != null ) { lbl4.Text = ddl.SelectedItem.Text; lbl4.ForeColor = System.Drawing. Color .FromName(lbl4.Text); } } 5. Server.Transfer Using this technique, form values of one page can be accessed in another page by enabling second parameter to true. Also, the same for the Server.Execute method. Using Server.Transfer protected void btnPage2_Click( object sender, EventArgs e) { Server.Transfer( "RetrieveData.aspx" , true ); } Retrieving a Server.Transfer value if (Request.Form[ "ddl1" ] != null ) { lbl5.Text = Request.Form[ "ddl1" ]; } Other ways that are used much are Submit Form, Context.Handler, Static variables, Saving data to XML, Text file etc.. or a Database and later retrieve it another form. Please refer the below link for more http://www.c-sharpcorner.com/uploadfile/suthish_nair/different-ways-to-pass-data-between-web-forms/ http://msdn.microsoft.com/en-us/library/6c3yckfw.aspx Thanks