RadGrid for ASP.NET AJAX
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RadControls for ASP.NET AJAX

Telerik RadGrid can export to CSV format (comma-separated values).

exportToCsv()

Example:

CopyJavaScript
function ExportGrid() {
    var masterTable = $find("<%=RadGrid1.ClientID %>").get_masterTableView();
    masterTable.exportToCsv();

}