Sets the width - in points (1/72 of an inch) - of the specified column. When converted to character widths, this must be a value that is between 0 - 255.

 public void SetColumnWidth(int columnIndex, double width)
Public Sub SetColumnWidth(ByVal columnIndex As Integer, ByVal width As Double)

The column's 0-based index, relative to the first column in the area.

The width of the column, in points.

a.SetColumnWidth(0, 100);
a.SetColumnWidth(0, 100)