From the Cells property (ExcelRange) you can access these methods to loads data from various sources:

• LoadFromText and LoadFromTextAsync- Read a text file (csv, tsv, etc) and load the data into a range on a worksheet.
• LoadFromDataReader and LoadFromDataReaderAsync - Loads data into a range from an System.Data.IDataReader
• LoadFromDataTable - Loads data into a range from a System.Data.DataTable. Can be used for importing data from a range of sources, like XML (example provided) and databases.
• LoadFromCollection - Loads data into a range from an IEnumerable using reflection.
• LoadFromCollection using attributes - Loads data into a range/table from an IEnumerable using reflection. Uses attributes that specifies styling, number formats, formulas, etc.
• LoadFromDictionaries - Loads data into a range from an IEnumerable of ExpandoObject/dynamic objects (via their IDictionary<string, object> interface. Useful for importing json data, example provided.
• LoadFromArrays - Loads data into a range from an IEnumerable of object[] where each object array becomes a row in the worksheet.

You can optionally specify a parameter to create an ExcelTable when you use these methods.

• Sample 2 - C# or Sample 2 - VB.
• Import/Export data overview