private void TBCustomerName_TextChanged(object sender, EventArgs e)
{
param = "Sales Report for Searching of keywords ' " + TBCustomerName.Text + " '";
Dictionary <string, string> dic = new Dictionary <string, string>();
dic.Add("searchingtext", TBCustomerName.Text);
dataGridView1.DataSource = ConnectionClass.proc_Select("Bills_Search", dic);
calculation();
}