Querystring in Asp.net

 Client Side State Management


(QueryString,Control State,Hidden Field,Cookie,ViewState)


For Cookies: Click to View Example


For ViewState: Click to View Example

For Hidden Field :  Click to View Example

For Control State:   Click to View Example

1. QueryString : 



A query string is information that is appended to the end of a page URL. 

Query strings provide a simple but limited way to maintain state information. For example, they are an easy way to pass information from one page to another, such as passing a product number from one page to another page where it will be processed. However, some browsers and client devices impose a 2083-character limit on the length of the URL.

Example:

Country.aspx

        <a href="clientsidestatemanagement.aspx?state=1" >USA</a>

        

        <a href="clientsidestatemanagement.aspx?state=2" >INDIA</a>

State.aspx

in .cs page

        

Protected Sub Page_Load(Object sender,EventArgs e)

        {

        If (Request.QueryString.Get("state").ToString() <> "") 

            {

            state = Request.QueryString.Get("state").ToString();

            If (state = 1) 

              {

                DropDownList1.Items.Add("newyork");

                DropDownList1.Items.Add("California");

              }

          

            If (state = 2)

             { 

                DropDownList1.Items.Add("Mumbai");

                DropDownList1.Items.Add("Delhi");

             }

       }

2.