ASP.NET :is there a limit for parameter length in querystring? - asp.net

Question

I have a problem when passing parameters in querystring. I found that its values are null.
Below my code snippet:
page1 - here I am passing some parameters:
Response.Redirect(string.Format("RequestReservationPage.aspx?plcName={0}&PLCIndex={1}&Email={2}&form={3}&to={4}&SR={5}&Comment={6}", lblPLCNameVal.Text, index, lblEmailVal.Text, DateTime.Parse(lblReqFromVal.Text).ToShortDateString(),DateTime.Parse(lblReqToVal.Text).ToShortDateString(), lblServReqNum.Text, lblYourCommentVal.Text));
page2 - here I am requesting its values:
cmbPLCRequest.SelectedIndex = Convert.ToInt32(Request.QueryString["PLCIndex"]);
txtEmail.Text = Convert.ToString(Request.QueryString["Email"]);
txtSR.Text = Convert.ToString(Request.QueryString["SR"]);
txtComment.Text = Convert.ToString(Request.QueryString["Comment"]);
txtReqFromDate.Text =Request.QueryString["from"];
txtReqToDate.Text = Request.QueryString["to"];
but I found that both of Request.QueryString["from"] and Request.QueryString["to"] return null
any idea?

Answer 1

see this
The amount of data you can transfer on
the QueryString is limited by a number
of factors, but the one that seems to
be the most restrictive is the space
in your browser's address bar. The
Internet Explorer versions 5 and 6
that I tested only allowed up to 2,047
characters while Netscape Navigator
version 4 seemed to be able to handle
up to 30,000 and I couldn't get
version 6 much past 9,000.
See this MSDN article for other options instead of passing variables by using the querystring
EDIT: try storing your values in the POST parameters if you need large strings

Answer 2

Two problems: typo in the from - in the Redirect code you got it as form.
Also, you better encode all the values to be fit for URL.. so the code will be:
Response.Redirect(string.Format("RequestReservationPage.aspx?plcName={0}&PLCIndex={1}&Email={2}&from={3}&to={4}&SR={5}&Comment={6}",
Server.UrlEncode(lblPLCNameVal.Text),
index,
Server.UrlEncode(lblEmailVal.Text),
Server.UrlEncode(DateTime.Parse(lblReqFromVal.Text).ToShortDateString()),
Server.UrlEncode(DateTime.Parse(lblReqToVal.Text).ToShortDateString()),
Server.UrlEncode(lblServReqNum.Text), Server.UrlEncode(lblYourCommentVal.Text)));