Get checkbox list values to a single string

Question

I'm trying to get checkbox list values to a single string. in ASP.net using C#.

Here's my code.. I have declared this globally.

   string hobbies = "";

This is the code to get the selected items to a string.

   protected void chkListHobbies_SelectedIndexChanged(object sender, EventArgs e)
   {
      for (int i=0;i<chkListHobbies.Items.Count;i++)
      {
         if (chkListHobbies.Items[i].Selected)
         {                
            hobbies += chkListHobbies.Items[i].Value + ",";
          }

    }
   hobbies = hobbies.TrimEnd(',');

I'm displaying this on button click

     protected void btnEnter_Click(object sender, EventArgs e)
     {
      Response.Write("Hobbies= "+hobbies);
     }

It doesn't give the expected output. Would like to get this corrected if it's wrong or would like to know how to do it properly. Thanks in advance.

brz · Accepted Answer · 2014-09-06 08:25:43Z

You have to create hobbies list in your btnEnter_Click event handler because Asp.net webforms in stateless and you'll get a new hobbies variable after each postback. To address this issue you have to save hobbies state somehow (using viewstate or a hidden field) and use it later or as I suggested create hobbies list in btnEnter_Click.

Edit (examples):

1.Do the whole thing in btnEnter_Click:

protected void btnEnter_Click(object sender, EventArgs e)
   {
      string hobbies = "";
      for (int i=0;i<chkListHobbies.Items.Count;i++)
      {
         if (chkListHobbies.Items[i].Selected)
         {                
            hobbies += chkListHobbies.Items[i].Value + ",";
          }

    }
   hobbies = hobbies.TrimEnd(',');
   Response.Write("Hobbies=" + hobbies);

2.Use ViewState:

private string hobbies
{
   get { return (ViewState["hobbies"] ?? "").ToString(); }
   set { ViewState["hobbies"] = value; }
}

and the rest of your code is exactly the same.

Collectives™ on Stack Overflow

Get checkbox list values to a single string

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related