Displaying Data in Rich Textbox Using C#

Question

5.00/5 (1 vote)

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I have a rich textbox in a Windows Forms Application.
I want to display data from a for loop. My Code is:

C#

ArrayList arr = new ArrayList();
                for (int i = frm; i <= to; i++)
                {
                    //I have stored the data as barcode by concatinating and adding it to arr

                    barcode = prefix + i + suffix;
                    arr.Add(barcode);
                    //MessageBox.Show(barcode);               
                }
                richTextBox1.Text = arr.ToString();
                foreach (string s in arr)
                {

                    richTextBox1.Text = s;
//WHat should i do next to display the coming output from my foreach loop to that richtextbox?
//Currently it shows the last element of my output. How to display all the list elements?

Posted 26-Nov-13 21:24pm

Jiban jyoti Rana

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Karthik_Mahalingam 27-Nov-13 3:41am

you r assigning value to the richtextbox in the for loop , so ofcourse it will store only the last data of the loop collection..
u can check my solution for it...

2 solutions

Solution 2

First off arr.ToString won;t help it will just give you the name of the type, rather than any of the content. Namely "System.Collections.ArrayList"

Second, please don't use ArrayList any more - it was superceded nearly ten years ago with teh much safer and more flexible generic collection such as List<>

Thirdly, your problem is simply that you are setting the rich text box text each time, throwing away any previous text.

Try this:

C#

List<string> list = new List<string>();
for (int i = frm; i <= to; i++)
    {
    //I have stored the data as barcode by concatinating and adding it to arr

    barcode = prefix + i + suffix;
    list.Add(barcode);
    //MessageBox.Show(barcode);
    }
StringBuilder sb = new StringBuilder();
foreach (string s in list)
    {
    sb.Append(s);
    }
richTextBox1.Text = sb.ToString;

Or if you don't need the data again:

C#

richTextBox1.Clear();
for (int i = frm; i <= to; i++)
    {
    richTextBox1.AppendText(string.Format("{0}{1}{2}", prefix, i, suffix));
    }

Replaces all of your code...

Posted 26-Nov-13 21:43pm

OriginalGriff

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Karthik_Mahalingam · Accepted Answer · 2013-11-26T21:41:00

Try this code...

C#

private void Form1_Load(object sender, EventArgs e)
       {
           string barcode = "";
           string prefix = "prefix";
           string suffix = "suffix";
           int frm = 0;
           int to = 10;
           ArrayList arr = new ArrayList();
           for (int i = frm; i <= to; i++)
           {

               barcode = prefix + i + suffix;
               arr.Add(barcode);
           }

           foreach (string s in arr)
           {  richTextBox1.Text  += s + Environment.NewLine;
           }
       }