Object reference not set to an instance of an object

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Hi,

I am working on an asp.net/C# project and I am a beginner in webprogramming. I get the below error on runtime:

"Object reference not set to an instance of an object."

Below is my code:

C#

protected void Page_Load(object sender, EventArgs e)
        {
            txtUsername.Focus();
            if (cmbThemes.SelectedItem.Text=="Red")
            {
                pnlSignin.Border.BorderColor = Color.Orange;
            }
        }

cmbThemes is a combobox.

Thanks in advance

Posted 26-Nov-13 19:50pm

Rahul Krishnan R

Updated 26-Nov-13 20:26pm

v2

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Comments

Karthik_Mahalingam 27-Nov-13 1:57am

how combobox came in asp ???
pls modify your question....

Rahul Krishnan R 27-Nov-13 2:24am

I am using DevExpress web controls.It has combobox.

Karthik_Mahalingam 27-Nov-13 2:52am

Sorry dude, but always pls mention in detail :)

Maciej Los 27-Nov-13 1:58am

My guess: SelectedItem doesn't exists in this context, because you have moved focus to the other control.

Thomas ktg 27-Nov-13 2:01am

Make sure the ComboBox is bound with the datasource and that has value in it before checking with if statement.

Rahul Krishnan R 27-Nov-13 2:28am

I am getting the error inside the if condition. pnlSignin is the panel i am using and getting the error there.

[no name] 27-Nov-13 2:56am

add the namespace and try, if is not added.
using System.Drawing;

Rahul Krishnan R 27-Nov-13 3:13am

namespace is already added

3 solutions

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**Dnyaneshwar**@Pune · Answer 1 · 2013-11-26T19:57:00

Solution 1

Either your dropdown does not contain the Item named as Red or the dropdown does not contain any items.
Please check all the Items in the dropdown.

Posted 26-Nov-13 19:57pm

Dnyaneshwar@Pune

Comments

Rahul Krishnan R 27-Nov-13 2:28am

I am getting the error inside the if condition. pnlSignin is the panel i am using and getting the error there.

[no name] 27-Nov-13 2:53am

can you post your .aspx and .aspx.cs code here, i will try to solve your problem..

Madhu Nair · Answer 2 · 2013-11-26T19:58:00

Solution 2

You are getting this error because you are trying to access the selecteditem.text property in the page load without binding the dropdown!!!!!

Posted 26-Nov-13 19:58pm

Madhu Nair

Comments

Rahul Krishnan R 27-Nov-13 2:28am

I am getting the error inside the if condition. pnlSignin is the panel i am using and getting the error there.

JoCodes 27-Nov-13 3:08am

Yes .. Madhu is right .. Your combobox is not loaded/bound yet..Debug and check

*Suvabrata Roy* · Answer 3 · 2013-11-26T20:42:00

Solution 3

Hi,

Put debug point at that line.

Now check pnlSignin is null or its an instance.

If its null then check your aspx page or send the whole code to us

Posted 26-Nov-13 20:42pm

Suvabrata Roy