Index was outside the bound of array

Question

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C#

string str = textBox1.Text;
textBox1.Text = "";
int i = str.Length;
for (int j = 0; j < i - 1; j++)
{
    textBox1.Text += Convert.ToString(str[i]);
}

Above is back sapce coding....when i am going to run than error "Index was outside the bound of array" is coming

Posted 12-May-13 23:17pm

sakshi111

Updated 12-May-13 23:18pm

v3

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2 solutions

Solution 2

You have to convert the string into char array and then do foreach loop.

Example:

C#

if (TextBox1.Text != string.Empty)
            {
                string str = TextBox1.Text;
                char[] array = str.ToCharArray();
                TextBox1.Text = "";

                foreach (char c in array)
                {
                    TextBox1.Text += Convert.ToString(c);
                }
            }

Posted 12-May-13 23:26pm

Mohammed Hameed

Comments

Mohammed Hameed 13-May-13 5:29am

If any queries let me know....

TanvirRaihan 13-May-13 5:36am

string itself is a array of char. Why you need to convert it?

Mohammed Hameed 13-May-13 5:49am

String is not array but it is a sequence of unicode chars.
Refer: http://msdn.microsoft.com/en-us/library/362314fe(v=vs.100).aspx

And check the below msdn link and see that even microsoft follows this pattern of converting string to char array. As far as I am aware this is how we deal with chars.
http://msdn.microsoft.com/en-us/library/2c7h58e5.aspx

If any more queries plz let me know.

sakshi111 13-May-13 6:31am

sir this code is not working....when i clicking at backspace than nothing is cahanging

Mohammed Hameed 13-May-13 7:05am

Please check the first if condition, Textbox.text should not be empty. If it is empty then nothing will change.

sakshi111 13-May-13 7:09am

no its not empty

MuhammadUSman1 14-May-13 1:05am

Dear Sakshi111!
I couldn't understand your question?

Do you want to remove last character of text in TextBox1?
Or
You Want to Show all text in reverse order.

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TanvirRaihan · Accepted Answer · 2013-05-12T23:25:00

Solution 1

Hi
Don't you think the code will be :

textBox1.Text += Convert.ToString(str[j]);

instead of

textBox1.Text += Convert.ToString(str[i]);

Posted 12-May-13 23:25pm

TanvirRaihan

Comments

Mohammed Hameed 13-May-13 5:28am

Ideally, the approach should be like the below solution...

sakshi111 13-May-13 5:34am

thank u it was minor mistake

Mohammed Hameed 13-May-13 5:38am

But ideally you have to use a char array in this scenario. You can verify the Solution 2 for example.

sakshi111 13-May-13 6:17am

why???