The error occured while executing the .net accout project. How to solve it

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.NET

.NET4

"Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding"

private void FillInvoiceNo()
        {
            try
            {
                if (_custid > 0 && _branchid > 0)
                {
                    //_Invoiclst = accobj.GetInvoiceByCustomerID(56, 0, 1, 2).EntityList;
                    _Invoiclst = accobj.GetInvoiceByCustomerID(_custid, _VoucherID, ConstStrings.CompanyID, _branchid).EntityList;
                    cboInvoice.DataSource = _Invoiclst;
                    cboInvoice.DisplayMember = "InvoiceNo";
                    cboInvoice.ValueMember = "InvoiceID";
                }

            }
            catch (Exception ex)
            {
                ShowInfoMessage(ex.Message);
            }
        }