Its doenst clean my textbox? What happen?

Question

Hi!


I write this code to start always with a capital letter in my textbox. its works!
But what happen? When I click on my button to clean my textbox (or combobox). I receive this message: Index was outside the bounds of the array. What happen?

Code to have the first capital letter:

 private void txtdesignation_TextChanged(object sender, EventArgs e)

        {

            char[] v = txtdesignation.Text.ToCharArray();

            string s = v[0].ToString().ToUpper();

            for (int b = 1; b < v.Length; b++)

                s += v[b].ToString().ToLower();

            txtdesignation.Text = s;

            txtdesignation.Select(txtdesignation.Text.Length, 0);

        }

Code to clean my textbox:
txtdesignation.Text = "";