how to pass more than one value in session and catch it in anothe page and assign it to dropdownlist...

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i m passing three values like employeecode,month and year in session.And also catch the value of three variable in another page.but when i m assigning these values to three different dropdownlist like drpempcode,drpmonth,drpyear a error occures "an object reference not set to instance of an object".
please help me.....to solve this.....

Posted 24-Aug-12 20:27pm

Manash Sahoo

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Richard MacCutchan 25-Aug-12 4:31am

Use your debugger to find out which object you are trying to use without initialising it.

SinghPrateek 25-Aug-12 6:13am

Are you getting the error on session on dropdownlist object?
Share code, than we could help in finding the cause

2 solutions

Solution 2

Use Query strings to pass value from one page to another.And you can access the values from the query string.

Send the required value to the target page(Let it be Default2.aspx) like this

C#

Response.Redirect("Default2.aspx?pid=" +txtData.Text);

You can access the values at the target page(Default2.aspx).
eg:

C#

string projectid = Request.QueryString["pid"];

You can send multiple values throug query string like this using '?' and '&'

C#

Response.Redirect("Default2.aspx?pid=" +txtData.Text + "&fid=" + txtcountry.Text);

and access the values in same way.

C#

string projectid = Request.QueryString["pid"];
string FeatureId= Request.QueryString["fid"];

Posted 25-Aug-12 2:30am

Sreegth V

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Christian Graus · Accepted Answer · 2012-08-24T23:20:00

You need to post code if you want us to fix it. If you have three values that are related, create a class and store it in the session. If you pull values out of the session, always check if they are null first. A good trick is to create a static class like

static class SessionStrings
{
public static string UserId = "UserId";
}

Now when you access the session, do:

string s = Session[SessionStrings.UserId] as string;

Now you can't make typos.