How to store DropDownList values into variables at page load ?

Question

4.20/5 (2 votes)

See more:

If I store the following items in a DropDownList:
123
124
125
126
how can I store these dropdown list items into variables like below at Form load without selecting any of the items:
For example:
int a=dropdownlist1[0],
int b=dropdownlist1[1],
int c=dropdownlist1[2],
int d=dropdownlist1[3],
How can this happen dynamically at page load time using C# ? please help me..

Posted 11-Apr-14 6:27am

Member 10624163

Updated 13-Apr-14 9:10am

Rahul VB

v3

Add a Solution

Comments

ZurdoDev 11-Apr-14 12:40pm

You can loop through them but why are you doing this?

Member 10624163 11-Apr-14 23:48pm

its for different way of verify the online test result.

Member 10624163 11-Apr-14 23:50pm

loop means which kind of loop statement is flexible for this and how to use that?

ZurdoDev 12-Apr-14 8:50am

I still have no real idea of what your question is.

Herman<T>.Instance 11-Apr-14 13:20pm

Use SelectedIndex prop and SelectedIndexChanged Event

Member 10624163 13-Apr-14 10:56am

Thank u Sir, Its very useful for me.....

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

DotNet WeblineIndia · Accepted Answer · 2014-04-11T22:59:00

Solution 1

I suggest to use array, as it will consume less memory space than the individual variables. You can store all the values in the array, As i have shown below.

Dropdown that you are going to use, should be bind (Should be filled) before using below code

C#

string[] arrItems = new string[dropdown.Items.Count];
    if (dropdown.Items.Count > 0)
    {
        for (int i = 0; i < dropdown.Items.Count; i++)
        {
            arrItems[i] = dropdown.Items[i].ToString();
        }
    }

Hope this will help you.

Posted 11-Apr-14 22:59pm

DotNet WeblineIndia

Updated 11-Apr-14 23:09pm

v2

Comments

Rahul VB 12-Apr-14 5:20am

Good one

Member 10624163 13-Apr-14 10:55am

Thank u Sir, Its very useful for me.....

Rahul VB 13-Apr-14 15:01pm

Firstly dont call me Sir, we are friends here. The code which i wrote can be improved further, you must find out how to improve it and let me know. this is just for your homework so that you learn.

- Rahul

Rahul VB · Accepted Answer · 2014-04-11T23:04:00

Hello Friend,
Ok so by what i understand you need to iterate through a collection of datasource items and store them into a separate variable for further analysis:

I agree with RyanDev however i will show you the code:

I will start with the code behind directly, because you can declare a drop down list in the aspx.
Please note i am using programatic databinding and not declarative:

Id used by me for the dropdownlist is

Quote:
drop

hence i will use that name to refer the drop down list control.

C#

protected void Page_Load(object sender, EventArgs e)
  {

      if (!IsPostBack)      ////this is not required in this scenario......
      {
      drop.DataSource = new List<int> { 0, 1, 2, 3, 4 }; ///i have assigned an array of ints to the datasource.
          drop.DataBind();       /// bind it to the control
          int[] array = new int[drop.Items.Count]; ///i have used an array to store the items of the collection.

          foreach(ListItem item in drop.Items) // iterate through all items
          {
              array[n] = int.Parse(item.Value); /// start storing
              Response.Write("Item:" + n + "  Value :" + array[n].ToString() + ",");///print the data in the format Item:0 Value:0
              n++;
          }
      }
  }

This will work.
I have some of my doubts:
why do you need a seperate variable to store every item in the collection, because then you will be needing those many variables at runtime....
Indirectly, i want to say use an array.

However my code is very badly written, its very redundant. There was no need to take an array to store items.

I can use the Items property of the DropDownList collection to access the data, no need to use separate variables, no use of an array. I can directly traverse through the collection of Items.

Every thing above is dynamic as you said,
This code however should serve your purpose. Please let me know if it doesn't run.

Thanks a ton,
Rahul