Format the selected range of cells from the current sheet as a table (with the first row formatted as a header).
As the first row is always formatted as a table header, you need to select at least two rows for the table to be formed correctly.
builder.CreateFile("xlsx"); var oWorksheet = Api.GetActiveSheet(); oWorksheet.FormatAsTable("A1:E10"); builder.SaveFile("xlsx", "FormatAsTable.xlsx"); builder.CloseFile();
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