List<string> listWhere = new List<string>();
            List<SqlParameter> listParameters = new List<SqlParameter>();
            if (cbName.Checked)
            {
                listWhere.Add("Name like @name");
                listParameters.Add(new SqlParameter("name","%"+txtQueryName.Text+"%"));
            }
            if (cbMobile.Checked)
            {
                listWhere.Add("MobilePhone like @mobile");
                listParameters.Add(new SqlParameter("mobile", "%" + txtQueryMobile.Text + "%"));
            }
           string sql = "select * from T_Customers\n";
            
            if (listWhere.Count > 0)
            {
                string sqlWhere = string.Join(" and ", listWhere.ToArray());
                sql =sql+" where "+sqlWhere;
            }
            dataGridView1.DataSource = SqlHelper.ExecuteDataTable(sql, listParameters.ToArray());