Find First repeated and unrepeated character in a string

       protected void Button1_Click(object sender, EventArgs e)

        {

            string Inputstring = TextBox1.Text.ToString();

            string notRepeatedChar = string.Empty; string repeatedChar = string.Empty;

            bool statusRepeated = false, statusNotRepeated = false;

            for (int i = 0; i < Inputstring.Length - 1; i++)

            {

                if (!statusRepeated || !statusNotRepeated)

                {

                    string s = Inputstring[i].ToString();

                    for (int j = i+1; j <= Inputstring.Length - 1; j++)

                    {

                        if (s == Inputstring[j].ToString())

                        {

                            repeatedChar = s;

                            if (!statusRepeated)

                            {

                               

                                Label1.Text = " '" + s + "' " + " is the first repeated character.";

                                statusRepeated = true;

                               

                            }

                        }

                        else if (j == Inputstring.Length - 1)

                        {

                            notRepeatedChar = s;

                            if (!statusNotRepeated)

                            {

                                if (!repeatedChar.Equals(notRepeatedChar))

                                {

                                    Label2.Text = " '" + notRepeatedChar + "' " + " is the first un-repeated character.";

                                    statusNotRepeated = true;

                                }

                            }

                        }

                    }

                }

            }

        }