We take pride in your success. We let our positivity drive us, day in and out. Talk to us at Mindfire to know us more.

Software Technology Tips

At times we need to pass some values across pages in our application. Now, as commonly known, HTTP is based upon stateless protocol, it can't remember status of the past requests. So we have to explicitly manage state of the page. There are various Client side state management as well as server side state management techniques for managing state of the requests. Client side state management techniques (Viewstate, Clientstate, Hiddenfield, Cookies) are suitable if you are staying in the same page(except cookies which store some information in client browser). But when you want to pass values from one page to another here are some of the ways which can help.

I. Using Server.Transfer()

When we redirect any page using Server.Transfer() we ask the server to change only the control of the page from one page to another. So in that case we can get the previous page controls values.

protected void btnAdd_Click(object sender, EventArgs e)

{

Server.Transfer("SendInfo.aspx",true);

}

The second parameter denotes weather to persist the current control state or not.

II. Using PostBackUrl property

Another way of passing information easily by using the "PostBackUrl" property of the button control. This property used to post to a different page.

<asp:Button ID="btnCreate" runat="server" Text="Create" PostBackUrl="~/sendInfo.aspx" onclick="btnCreate_Click" />

X [The page should be present inside the same application. you can't use this property like below

X [<asp:Button ID="btnCreate" runat="server" Text="Create" PostBackUrl=www.google.com />]

Track previous page
In the destination page we can track previous page and values of the controls like below.

Page prevPage = Page.PreviousPage;
if (prevPage != null)
{

// Write your code logic

}

Complete Code Block

The Complete Code Block may look like this.

First.aspx

----------

<asp:TextBox ID="txtPostData" runat="server" Text="aditya"></asp:TextBox>

<asp:Button ID="btnPost1" runat="server" Text="Manual" onclick="btnPost1_Click" />

<asp:Button ID="btnPost2" runat="server" Text="Post Using PostBackUrl" PostBackUrl="~/NextPage.aspx" onclick="btnPost2_Click" />

First.aspx.cs

----------

protected void btnPost1_Click(object sender, EventArgs e)

{

txtPostData.Text = "A Acharya";

Server.Transfer("sendInfo2.aspx",true);

}

protected void btnPost2_Click(object sender, EventArgs e)

{

txtPostData.Text = "A Acharya";

}

NextPage.aspx.cs

----------

protected void Page_Load(object sender, EventArgs e)

{

Page prevPage = Page.PreviousPage;

if (prevPage != null)

{

TextBox txtPrevPageName = (TextBox)prevPage.FindControl("txtPostData");

if (txtPrevPageName != null)

{

Response.Write(txtPrevPageName.Text);

}

}

}

[PostBackUrl property depends upon javascript. So it will not work properly if javascript is disabled in the browser.]

Related Tags:
ASP.NET, Server.Transfer, PostBackUrl

Author: Aditya Acharya

ASP.NET

More Related Tips

Software Technology Tips

ASP.NET

Let us Connect!