SharePoint Check Logged in User is belong to any Type

In this code snippet, i will explain you how to List items where Logged In user has Created List item / Modified List Item / It belong to custom list column.

In SharePoint List each column is having internal name. some time column name & its internal name is different.

Created By column - internal name -> Author.

Modified By column - Internal Name -> Editor.

ContactDetails list contains column "AllUser" type -> Person or Group (Allow Multiple Selection = true).

Below code snippet fetch list records where current user has created list items or modified list items or it belong to "AllUser" group.

List oList = clientContext.Web.Lists.GetByTitle("ContactDetails");
CamlQuery camlQuery = CamlQuery.CreateAllItemsQuery();

string UserTilte = "Rupali Shinde";
string QueryStr = "";
//Created By  - Internal Name -> Author
//Modified By - Internal Name -> Editor
//Check loggedIn User is belog to any of 3 type - Author/Editor/AllUser(user defined column).
QueryStr = @"<View>" +
                  "<Query>" +
                         "<Where>"+
                            "<Or>" +
                                "<Eq>" +
                                    "<FieldRef Name='Author'/>" +
                                    "<Value Type='User'>" + UserTilte + "</Value>" +
                                "</Eq>"+
                              "<Or> " +
                                "<Contains>" +
                                    "<FieldRef Name='AllUser'/>" +
                                    "<Value Type='UserMulti'>" + UserTilte + "</Value>" +
                                "</Contains>" +
                                "<Eq>" +
                                    "<FieldRef Name='Editor'/>" +
                                    "<Value Type='User'>" + UserTilte + "</Value>" +
                                "</Eq>"+
                              "</Or>" +
                           "</Or>" +
                        "</Where>" +
                  "</Query>" +
          "</View>";

camlQuery.ViewXml = string.Format(QueryStr);

Microsoft.SharePoint.Client.ListItemCollection collListItem = oList.GetItems(camlQuery);
clientContext.Load(collListItem);
clientContext.ExecuteQuery();

int itemcount = collListItem.Count;