Possible to add letters to existing strings in Textbox

Question

is it possible to add numbers to existing strings in a listbox. I can do it in a treeview, like below;

treeView1.Nodes[0].Text = treeView1.Nodes[0].Text + "2,";

So the string on the text would be "JOHN DOE - A" after a button click

EDIT 1 : I have it kind of working;

 var words = new List<string>();

        if (ckbAnswerA.Checked)
            words.Add("-A,");

        if (ckbAnswerB.Checked)
            words.Add("B,");

        if (ckbAnswerC.Checked)
            words.Add("C");

        treeView1.SelectedNode.Text =  string.Join(" ", words);

but it completely removes the original text, it should be

JOHN DOE - A,B,C but it returns -A,B,C

Its not quite clear what you want for me, please show the before - after more detailed. — Mafii
– Mafii, Commented Mar 24, 2016 at 9:36

Alfie Goodacre · Accepted Answer · 2016-03-24 10:53:39Z

1

There are quite a few options for doing this, one being outlined in Roma's answer, another is to use the += operator, like so

treeView1.SelectedNode.Text += String.Join(" ", words);

Using the method in Roma's answer, is would instead be

treeView1.SelectedNode.Text = treeView1.SelectedNode.Text + String.Join(" ", words);

The part that you were missing is that you are assigning the text to the joined string, but forgetting to first add the original string to the start of it.

This is what the += does for you.

In addition to this, though not a syntax error, if both boxes B and C are ticked but A is not, the dash will not be displayed because it is added one when box A is ticked, it may be worth adding it before you check instead.

edited Mar 24, 2016 at 10:53

answered Mar 24, 2016 at 10:46

Alfie Goodacre

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8 Comments

AndroidAL Over a year ago

Thanks, but when i click answer B, it turns A,B ?

Alfie Goodacre Over a year ago

What do you mean by that? could you give more information on what happens now, maybe with your updated code?

AndroidAL Over a year ago

it returns JOHN DOE - A, A,B when i have both ckbAnswerA and ckbAnswerB checked.

Alfie Goodacre Over a year ago

Based on the code shown that would suggest that ticking box A produces - A, but ticking box B mistakenly produces A,B

AndroidAL Over a year ago

Correct, that is what happens?

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