entity to linq where clause - vb.net

Question

I am using entity to linq
Please find my linq query -
Using lcntxRT60Entities As New RT60Entities(EntityConnection)
Dim lstrDocumentWhereClause As String
lstrDocumentWhereClause = astrDocumentWhereClause & " AND it.TransactionType = " + aintTransactionType.ToString + " AND it.VoidIndicator = 0"
lstrDocumentWhereClause = lstrDocumentWhereClause & " AND it.RtRouteDetails.RouteNumber = " + aintRouteNumber.ToString
If adatFromDate.ToString IsNot Nothing And adatToDate.ToString IsNot Nothing Then
adatToDate = adatToDate.AddHours(23).AddMinutes(59).AddSeconds(59)
lstrDocumentWhereClause = lstrDocumentWhereClause & " AND (it.TransactionDateTime BETWEEN DATETIME'" & Convert.ToDateTime(adatFromDate).ToString("yyyy-MM-dd HH:mm") & "' AND DATETIME'" & Convert.ToDateTime(adatToDate).ToString("yyyy-MM-dd HH:mm:ss") & "')"
End If
Dim Documents = From CTH In lcntxRT60Entities.RtCstTrnHeader.Where(lstrDocumentWhereClause) _
Join C In lcntxRT60Entities.RtCustomer.Where(astrCustomerWhereClause) On CTH.RtCustomer.CustomerID Equals C.CustomerID _
Select CTH, C _
Order By CTH.RouteKey, CTH.VisitKey, CTH.TransactionKey
Dim DocumentDetails = From Document In Documents.ToList _
Select Document.CTH
Return DocumentDetails.Skip(aintStartRow).Take(aintPageSize).ToList
i have problem with my where clause -
lstrFilterCriteria = "it.DocumentPrefix + it.DocumentNumber LIKE '" & lstrValue.ToString().Trim() & "'"
this throw conversion error .
If i use this
lstrFilterCriteria = "it.DocumentPrefix+SqlFunctions.StringConvert((integer)it.DocumentNumber) LIKE '" & lstrValue.ToString().Trim() & "'"
its throw syntax error .
how to convert concatenate this two column .
Document prefix is string and document number is integer .
Please suggest .
Thnaks

Answer 1

Using lcntxRT60Entities As New RT60Entities(EntityConnection)
Dim query=lcntxRT60Entities.RtCstTrnHeader
.Where(t=>t.TransactionType==aintTransactionType)
.Where(t=>t.VoidIndicator==0)
If adatFromDate.ToString IsNot Nothing And adatToDate.ToString IsNot Nothing Then
adatToDate = adatToDate.AddHours(23).AddMinutes(59).AddSeconds(59)
query=query.Where(t=>t.TransactionDateTime>adatFromDate && t.TransactionDateTime<adatToDate);
End If
query=query
.OrderBy(t=>t.RouteKey)
.ThenBy(t=>t.Visitkey)
.ThenBy(t=>t.TransactionKey)
Return query.Skip(aintStartRow).ToList
You will have to add in your own parameters for whatever astrDocumentWhereClause and astrCustomerWhereClause may contain before this as you didn't supply it in your example code.