How to pass value from one page to another page in ASP.NET

There are various techniques to pass values from one page to another page . These are Session, ViewState, QueryString, findControl , etc
Here we use one by one for passing values from one page to another page.

Use Session: 

Syntax : 
Session["Session variable"] = variable;
variable = Session["Session variable"].Tostring();

Note : Session value store in all page of browser.

Use QueryString 

Syntax : Basically query string pass in URL
http://dotprogramming.blogspot.com/default.aspx?id=7    // here id=7 define query string data

lets take an simple example
Step-1 : Take two Web forms (first.aspx and second.aspx)
Step-2 : first page contain one textbox , one button and one hyperlink control

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void Button1_Click(object sender, EventArgs e)
    {
        Session["username"] = TextBox1.Text;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    Enter Session data :
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
        <asp:Button ID="Button1" runat="server" Text="Store Session"
            onclick="Button1_Click" />
        <br />
        <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl ="~/second.aspx?id=7" >QueryString</asp:HyperLink>
        <br />
    </div>
    </form>
</body>
</html>

Step-3 : Second page contains two label control.

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = "Session data " + Session["username"].ToString();
        Label2.Text = "query string data" + Page.Request.QueryString["id"].ToString();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text=""></asp:Label><br />
        <asp:Label ID="Label2" runat="server" Text=""></asp:Label>

    </div>
    </form>
</body>
</html>


Output
How to pass value from one page to another page in ASP.NET

How to pass value from one page to another page in ASP.NET

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