C# Winform Returns in Subroutines

I have a subroutine in C# that executes code:

  private void txtPrice_TextChanged(object s, eventargs e)
        {
            if (!goThroughProcedure)
            {
                goThroughProc = true;
                return;
            }
            //to do did this because may change the price b4 on the dtProducts because already has a 1 by qty.
                foreach (DataRow row in dtProductsForInvoice.Rows)
                {
                    if (row["ITEM"].ToString() == txtID.Text)
                    {
                            row["Price"] = txtPrice.Text == ""? "0.00" : txtPrice.Text;
                            row["ExtPrice"] = (Convert.ToDecimal(row["Price"]) * Convert.ToInt32(row["Qty"])).ToString();
                            txtExtPrice.Text = row["ExtPrice"].ToString();
                            LoadListviewOnPriceChange();
                            if (txtPrice.Text.Length == 0)
                            {
                                goThroughProc = false;
                                txtPrice.Text = "0.00";
                                txtExtPrice.Text = "0.00";
                            }
                            return;
                }
            }
            if (nudQty.Value != 0)
            {
                DataRow row = dtProductsForInvoice.NewRow();
                row["Item"] = txtID.Text;
                row["Description"] = txtDesc.Text;
                row["Qty"] = nudQty.Value;
                row["Price"] = txtPrice.Text == "" ? "0.00" : txtPrice.Text;
                row["ExtPrice"] = (Convert.ToDecimal(row["Price"]) * nudQty.Value).ToString();
                row["Type"] = UserControl1.type;
                row["Type2"] = UserControl1.type2;
                row["ApplyDiscount"] = UserControl1.applyDiscount;
                dtProductsForInvoice.Rows.Add(row);
                LoadListviewadvanced();
                if (UserControl1.InvoiceType != "ar")
                {
                    btnSave.Enabled = true;
                }
                if (UserControl1.InvoiceType == "wo")
                {
                    btnSaveAsInvoice.Enabled = true;
                }
            }
            if (txtPrice.Text.Length == 0)
            {
                goThroughProc = false;
                txtPrice.Text = "0.00";
            }
        }

whenever it reaches the code of txtPrice.Text = "0.00";

the textchanged event happens again and even when I tell it to skip over certain code and return; it returns and then comes back into the procedure to do to the txtPrice.text = "0.00". Does that make sense or is there something wrong with my code?

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