5 Ways to send data between ASP.NET Pages

So, let’s start with the very well-known one.

Using Session State or Application Variable

Using this technique I will store the data in session variable on the client machine and on the next page will grab it. Using Application Variable instead of Session Variable is recommend by experts.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<br /><br />

<asp:Button ID="btnSessionState" runat="server" Text="Session State" OnClick="btnSessionState_Click"/>

Code-Behind:

protected void btnSessionState_Click(object sender, EventArgs e)

{

    Session["Data"] = txtData.Text;

    Response.Redirect("SessionState.aspx");

}

Receiver ASPX Page:

<div>

<h1>Session State</h1>

    Data is: <%=Session["Data"] %>

And you all set, run it test it.

Using Query String

Using this technique I will add my data with URL and on the next page will grab it.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<br /><br />

<asp:Button ID="btnQueryString" runat="server" Text="Query String" OnClick="btnQueryString_Click" />

Code-Behind:

protected void btnQueryString_Click(object sender, EventArgs e)

{

    Response.Redirect("QueryString.aspx?Data=" + Server.UrlEncode(txtData.Text));

}

Receiver ASPX Page:

<h1>Query String</h1>

        Data is: <%=Server.UrlDecode(Request.QueryString["Data"]) %>

And you all set, run it test it.

Using HttpPost

Using this technique I will call a post back url and the on next page using Request.From I will grab it.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<br /><br />

<asp:Button ID="btnHttpPost" runat="server" Text="HTTPPost" PostBackUrl="~/HttpPost.aspx" />

Note: There is no any code-behind method call instead of a postbackurl in button attribute.

Receiver ASPX Page:

<h1>HttpPost</h1>

        Data is: <%=Request.Form["txtData"] %>

And you all set, run it test it.

Using Public Properties

Using this technique I will send the using a public method and on the next page will grab it using PreviousPage.MethodName.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<br /><br />

<asp:Button ID="btnPublicProperties" runat="server" Text="Public Properties"OnClick="btnPublicProperties_Click" />

Code-Behind:

protected void btnPublicProperties_Click(object sender, EventArgs e)

{

    Server.Transfer("PublicProperties.aspx");

}

public string PublicData

{

    get

    {

        return txtData.Text;

    }

}

Receiver ASPX Page:

<h1>Public Properties</h1>

        Data is: <%=PreviousPage.PublicData %>

And you all set, run it test it.

Using Controls

Using this technique I will just redirect the user on next page and on the next page will use PreviousPage.FindControl to grab the data.

ASPX Page:

<asp:TextBox ID="txtData" runat="server"></asp:TextBox>

<br /><br />

<asp:Button ID="btnControl" runat="server" Text="Control" OnClick="btnControl_Click" />

Code-Behind:

protected void btnControl_Click(object sender, EventArgs e)

{

    Server.Transfer("Control.aspx");

}

Receiver ASPX Page:

<h1>Control</h1>

        Data is: <asp:Label ID="Label1" runat="server" Text="Label" />

Receiver Code-Behind Page:

protected void Page_Load(object sender, EventArgs e)

{

    var textbox = PreviousPage.FindControl("txtData") as TextBox;

    if (textbox != null)

    {

        Label1.Text = textbox.Text;

    }

}

GET and POST methods in ASP.NET/HTML and difference between GET and POST (GET vs POST)

Syntax:

<form method="get|post">
The method attribute uses either get or post. Default is GET method.

GET method:

This method appends form data to page request URL with key value pairs called as query string.


E.g.: http://www.dotnetmirror.com/home.htm?key1=value1&key2=value2 \

• Page request URL and the form data information (query string) are separated by the ? Character.
• Get method is restricted to send up to 1024 characters only.
• Never use Get method to send sensitive information like password, login information to web server.
• Form data support only ASCII characters.Cannot used to send binary information like word document, text file and image data to server.
• We can access query string in ASP.NET using Request.QueryString["key1"]
  

Example: Usage of Get method In ASP.NET/HTML:

In the below example we will see how GET method passed data from login.html (client) to login.aspx page (server).
Login.html

<html>
<body>
    <form method="get" action="Login.aspx">
    User Name: <input id="txtuserName" type="text" name="username" /> 
    <input id="btnSubmit" type="submit" value="Submit data using GET" />
    </form>
</body>
</html>

Output:


Login.aspx

<html>
<body>
    <form id="form1" runat="server">
    <div>
    Welcome <b><% Response.Write(Request.QueryString["username"].ToString()); %></b>
    </div>
    </form>
</body>
</html>

output:

Output Explanation: Login.html has username data which is sent using get method to login.aspx (server). In the output of second screen shot we can see there is key (username) value(DotNetMirror) data as query stirng in the URL which is submitted to login.aspx page and the output(Welcome DotNetMirror) is show in login.aspx page.

 Post Method:

• POST method transfers information over HTTP headers.
• Data transfer through HTTP headers so using secure HTTP protocol we can make sure that data is secured.
• No restriction on sending data size via Post and also we can send binary data or ASCII information using POST method.
• We can access form data in ASP.NET using Request.Form["key1"]
  

Example: Usage of Get method In ASP.NET/HTML:

In the below example we will see how POST method passed data from login.html (client) to login.aspx page (server).
Login.html

<html>
<body>
<form method="post" action="Login.aspx">
    User Name: <input id="txtuserName" type="text" name="username" />       
    <input id="btnSubmit" type="submit" value="Submit data using POST" />
    </form>
</body>
</html>

Output:


Login.aspx

<html>
<body>
    <form id="form1" runat="server">
    <div>
    Welcome <b><% Response.Write(Request.Form["username"].ToString()); %></b>
    </div>
    </form>
</body>
</html>

output:

Output Explanation: Login.html has username data which is sent using post method to login.aspx (server).The output (Welcome DotNetMirror) is show in login.aspx page.
Note: we can observe the post method did not send any query string like what we have seen in get method. Fig2 has query string where Fig4 does not have data in URL.

Usage of Post method:   

• If the form data is large then use POST method because GET method cannot handle long URL’s
• Form data contains Non-ASCII characters use POST because GET doesn’t support it.
  

 Difference between GET and Post:

GET	POST
Data will be arranged in HTTP header by appending to the URL as query string	Data will be arranged in HTTP message body.
Data is in query string so user can view the data	Not visible to user
Less secured compared to POST method because data is in query string so it will be saved in browser history and web server logs	Bit safer than GET method because data is not saved in history or web server logs
As data is saved in URL so its saves only 2048 bytes data	Can be used for any amount of data
Can be bookmarked	Can’t bookmarked
Hacking will be easy	Hacking is difficult
Only ASCII character data type allowed	No restrictions. Allows binary data also
Caching is possible	No caching