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Programmatically automatically fill ranges with incrementally changing data

The AutoFill method of the Range object enables you to fill a range in a worksheet with values automatically. Most often, the AutoFill method is used to store incrementally increasing or decreasing values in a range. You can specify the behavior by supplying an optional constant from the XlAutoFillType enumeration.

Applies to: The information in this topic applies to document-level projects and VSTO Add-in projects for Excel. For more information, see Features available by Office application and project type.

You must specify two ranges when using AutoFill:

Example

private void AutoFill()
{
    Excel.Range rng = this.Application.get_Range("B1");
    rng.AutoFill(this.Application.get_Range("B1","B5"), 
        Excel.XlAutoFillType.xlFillWeekdays); 

    rng = this.Application.get_Range("C1"); 
    rng.AutoFill(this.Application.get_Range("C1","C5"),
        Excel.XlAutoFillType.xlFillMonths);

    rng = this.Application.get_Range("D1","D2");
    rng.AutoFill(this.Application.get_Range("D1","D5"),
        Excel.XlAutoFillType.xlFillSeries); 
}