RadSpreadsheet for ASP.NET AJAX is a control that allows editing tabular data utilizing a variety of cell formatting options, functions and styles.
RadSpreadsheet is not supported for .NET Framework 3.5. and Internet Explorer 8.
Telerik Spreadsheet (Figure 1) provides the user the ability to:
Work with MS Excel files (.xlsx, .csv), and with .txt, .json files
Create, delete and reorder Worksheets
Set custom styles to cells, rows, columns or regions
Resize rows and columns
Intuitive Column, Row and Cell Selection
Use different data formats (currency, percent etc.)