How to determine each number of those contorols?

Question

Hi everyone.
I have 10 Lable and 10 TextBox.
I want to send a number of contorols on the form to sql and sql to do own order base on this number. 
How to determine each number of those contorols?

 private void btnSabtClerkEvaluation_Click(object sender, EventArgs e)

        {

            try

            {

                if (lbl1MadrakeTahsili1.Text.Trim() == string.Empty || lbl2Takhasos2.Text.Trim() == string.Empty || lbl3Khalaghiat3.Text.Trim() == string.Empty || lbl4Nazm4.Text.Trim() == string.Empty || lbl5Raftar5.Text.Trim() == string.Empty ||

                   lbl6Taamol6.Text.Trim() == string.Empty || lbl7Masouliatpaziri7.Text.Trim() == string.Empty || lbl8Arastegi8.Text.Trim() == string.Empty || lbl9MizaneKhata9.Text.Trim() == string.Empty || lbl10SakhtiKar10.Text.Trim() == string.Empty)

                {

                    MessageBox.Show("Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

                }

                else

                {

                    SqlCommand cmd = new SqlCommand("ClerkEvaluation_Insert", conn);

                    cmd.CommandType = CommandType.StoredProcedure;

                    for (int i = 0; i <= 10; i++)

                    {

                        cmd.Parameters.AddWithValue("@clrk_Name", txtNameClerkEvaluation.Text);

                        cmd.Parameters.AddWithValue("@clrk_Family", txtFamilyClerkEvaluation.Text);

                        cmd.Parameters.AddWithValue("@clrk_MelliCode", txtMelliCodeClerkEvaluation.Text);

                        cmd.Parameters.AddWithValue("@clrke_Percent", lbl[i].Text);// this name is lbl1. How to give number?

                        cmd.Parameters.AddWithValue("@clrke_Tozihat", txt[i].Text);// This name is lbl2

                        conn.Open();

                        cmd.ExecuteNonQuery();

                        conn.Close();

                    }

                }

            }
}