| ExecuteQuery | ExecuteQueryAsync |
| In ClientContext.ExecuteQuery method, operation will be executed synchronously. | In ClientContext.ExecuteQueryAsync method, operation will be executed asynchronously. |
| The current thread will wait till it gets response from server before continuing. | The current thread will not wait till it gets response from server. |
| This is helpful when you want to conditionally execute the next steps based on response from server. | You specify callback methods to catch the response from the server. |
| ExecuteQuery method is used in server object model | ExecuteQueryAsync is used in ECMA script object model |
| Syntax: ClientContext.ExecuteQuery() | Syntax: ExecuteQueryAsync(callback success,callback failure)
Here there are two callback parameters.
1) For success
2) For Failure |