Hello Team,
am developing a C# window application to scan product barcode and when i tried to scan the Barcode i get this error which says 
and this is my code please
private void txtPSearch_TextChanged(object sender, EventArgs e)
{
try
{
if(txtPSearch.Text == String.Empty)
{
return;
}else
{
String _pcode;
double _price;
int _qty;
cn.Open();
cm = new SqlCommand("select * from tblProduct where barcode like '" + txtPSearch.Text + "'", cn);
dr = cm.ExecuteReader();
dr.Read();
if (dr.HasRows)
{
frmQty frm = new frmQty(this);
qty = int.Parse(dr["qty"].ToString());
_pcode = dr["pcode"].ToString();
_price = double.Parse(dr["price"].ToString());
_qty = int.Parse(txtQty.Text);
dr.Close();
cn.Close();
frm.ShowDialog();
AddToCart(_pcode, _price, _qty);
}
else
{
dr.Close();
cn.Close();
}
}
}
catch (Exception ex)
{
cn.Close();
MessageBox.Show(ex.Message, stitle, MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}