Create a ListItem with Attachment using Client Object Model

FieldValuesAsTexts is a Dictionary which has been populated with some values.
using System;
using IO = System.IO;
using System.Linq;
using System.Runtime.Remoting;
using System.Text;
using System.Threading;
using Microsoft.SharePoint.Client;
using SP = Microsoft.SharePoint.Client;

string siteUrl = "http://servername:12345/";
SP.ClientContext ctx = new SP.ClientContext(siteUrl);
SP.List list = ctx.Web.Lists.GetByTitle("ListTitle");

SP.ListItemCreationInformation listItemCreationInfo = new SP.ListItemCreationInformation();
SP.ListItem oListItem = list.AddItem(listItemCreationInfo);

foreach (string key in FieldValuesAsTexts.Keys)
    if (ValidateKey(key))
        string strKey = fieldEntities.FirstOrDefault(t => t.FieldName == key).FieldInternalName;
        if (FieldValuesAsTexts[key] != String.Empty)
            string strVal = FieldValuesAsTexts[key];
            //You can not have a Yes/No value for a field/column whose type is bit. Hence replacing it with 1/0
            strVal = (strVal.ToLower().Trim() == "yes") ? "1" : (strVal.ToLower().Trim() == "no") ? "0" : strVal;
            oListItem[strKey] = strVal;
//This will create ListItem before adding attachments

//Let's say we have a custom class called AttachmentEntity and AttachmentsCollection is the //collection of the class Attachments.

if (listItemEntity.Attachments != null)
    foreach (AttachmentEntity attachEntity in AttachmentsCollection)
        string strFilePath = GetAbsoluteFilePath(strDirectoryPath, attachEntity.FileName);
        strFilePath = String.Concat(strFilePath, "\\", attachEntity.FileName);

        byte[] bytes = IO.File.ReadAllBytes(strFilePath);

        IO.MemoryStream mStream = new IO.MemoryStream(bytes);

        SP.AttachmentCreationInformation aci = new SP.AttachmentCreationInformation();
        aci.ContentStream = mStream;
        aci.FileName = attachEntity.FileName;

        SP.Attachment attachment = oListItem.AttachmentFiles.Add(aci);


Upload Forms, VIews to SharePoint using Client Object Model

First thing first, we need to use the namespace, using Microsoft.SharePoint.Client.
byte[] bytes = IO.File.ReadAllBytes(strFilePath);

IO.MemoryStream mStream = new IO.MemoryStream(bytes);

SP.File.SaveBinaryDirect(this.ctx, strServerRelativeUrl, mStream, true);

Remember, SaveBinaryDirect is use to upload Forms, & Views. You can’t upload a ListItem like, Document Library by this process. For other file types, plz check my other blog (will be posting shortly)