Cannot implicitly convert type 'int' to 'string'

Question

0.00/5 (No votes)

See more:

I am write the code for Listbox for calculating the sum of Total Numeric Values in present in ListBox.
i geting error like this-Cannot implicitly convert type 'int' to 'string'
Error shows here this line- TotalFees.Text = Total;
My ListBox values are this type
500
1000
1500
2000

help me anyone

What I have tried:

protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
   {
       int Total;
       foreach (string Str in ListBox1.Items)
       {
           Total = (Total + int.Parse(Str));
       }

       TotalFees.Text = Total;
   }

Posted 25-Mar-19 5:06am

Member 14083059

Updated 25-Mar-19 5:49am

v2

Add a Solution

3 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)

Gerry Schmitz · Answer 1 · 2019-03-25T05:24:00

Solution 1

TotalFees.Text = Total.ToString();

Posted 25-Mar-19 5:24am

Gerry Schmitz

Comments

Member 14083059 25-Mar-19 11:29am

now i am getting error this line Total = (Total + int.Parse(Str));
Error comment is - Use of unassigned local variable 'Total'

[no name] 25-Mar-19 11:35am

What "error"? It's not the same thing as before.

Member 14083059 25-Mar-19 11:37am

Use of unassigned local variable 'Total'

Chris A Clarke 25-Mar-19 14:10pm

Try initializing Total.

int Total = 0;

Then for fun try

var Total = ListBox1.Items.Cast<int>().Sum(); /// Textbox.Text = Total.ToString() or remove Total all together go to the TextBox.Text

Richard Deeming 26-Mar-19 16:00pm

Cast<int> won't work if the items are strings, which the foreach loop suggests is the case. :)

int Total = ListBox1.Items.Cast<string>().Select(int.Parse).Sum();

User 11060979 · Answer 2 · 2019-03-25T05:24:00

Solution 2

It is quite easy to solve this:

TotalFees.Text = Total.ToString();

Posted 25-Mar-19 5:24am

User 11060979

Richard MacCutchan · Answer 3 · 2019-03-25T05:49:00

Solution 3

C++

int Total = 0; // set Total to zero to start
foreach (string Str in ListBox1.Items)
{
    Total = (Total + int.Parse(Str));
}

You need to initialise Total before using it the first time. Just modify the code as above.

Posted 25-Mar-19 5:49am

Richard MacCutchan

Comments

Member 14083059 25-Mar-19 12:02pm

i used as above suggested code but still getting new error-"Unable to cast object of type 'System.Web.UI.WebControls.ListItem' to type 'System.String'."
This line- foreach (string str in ListBox1.Items)

Richard MacCutchan 25-Mar-19 14:17pm

ListBox items are not strings, please make use of the documentation: ListBox.Items Property (System.Windows.Forms) | Microsoft Docs[^]

Chris A Clarke 25-Mar-19 14:17pm

Ah ... WebControl ListItems have Text and Value string properties...

Using the foreach(ListItem str in ListBox1.Items)
{
Total += int.Parse(str.Value);
}

Or

Total = ListBox1.Items.Sum( c => Int.Parse(c.Value));