Are you using the .NET API, COM API, or the web API?

I am Using accpac advantage dll to open the view and import. But any reference would be fine. I just want to know how to post the batches in C# using this dll.

The easiest way to work this out is to record a macro where you create a new batch, add an invoice, and then post it. Then take the macro code and convert it to C#.

The code to post an AR batch is here though:

        private bool PostARInvoiceBatch(out string psError)
        {
            // oARIBC = AR0031
            // oARPostInv = AR0048
            bool bSuccess = false;

            psError = "";

            if (mbDebugMode) { HandleLogRequest($"In {MethodBase.GetCurrentMethod().Name}"); }

            try
            {
                oARIBC.Fields.FieldByName("PROCESSCMD").SetValue("2", false);
                oARIBC.Process();
                oARIBC.Fields.FieldByName("BTCHSTTS").SetValue("7", true);
                oARIBC.Update();
                oARIBC.Fields.FieldByName("PROCESSCMD").SetValue("0", false);
                oARIBC.Process();
                oARPostInv.Fields.FieldByName("BATCHIDFR").SetValue(oARIBC.Fields.FieldByName("CNTBTCH").Value.ToString().Trim(), false);
                oARPostInv.Fields.FieldByName("BATCHIDTO").SetValue(oARIBC.Fields.FieldByName("CNTBTCH").Value.ToString().Trim(), false);
                oARPostInv.Process();

                bSuccess = true;
            }
            catch (Exception ex)
            {
                psError = $"There was a problem posting AR invoice batch: '{ex.Message + Environment.NewLine + WriteSageErrorsToLog()}'";
                HandleLogRequest(psError);
            }

            return bSuccess;
        }

I have added comments telling you which views these are. You will need to know how to compose the views.