How to put integer variable in part of textbox's name?

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C#

C#4.0

Hi everyone
I have some TextBox and Lable. I want to put integer variable in part of TextBox's name.
for example:

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();
                    }
                }
            }
}

I want to send a number of Contorols on the form to sql and sql to do own order base on this number. I exactly want to determine when which one of lables are sending now. I should define lbl[i], because with 'i' i can send all Lable.Text or TextBox.Text order. I want to say lbl[i] (=lbl1) .Text to send now.but i have tried

cmd.Parameters.AddWithValue("@clrke_Percent", lbl[i].Name.Substring(3) + " " + lbl[i].Text);
cmd.Parameters.AddWithValue("@clrke_Tozihat", txt[i].Name.Substring(3) + " " + txt[i].Text);

and

When i write this line, I get this error
"Error2The name 'lbl' does not exist in the current contextD:\Project\evaluation\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs976119WindowsFormsApplication1"
Thx for your help.