How columns should be manged in OpenXML - openxml

Question

I have ceated a excel file with OpenXMl library with the follwing code.
The columns do not get theit widths as they are defined in the code.
Has anybody an idea?
WorkbookPart workbookPart = document.AddWorkbookPart();
workbookPart.Workbook = new Workbook();
WorksheetPart worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
worksheetPart.Worksheet = new Worksheet();
var workbookStylesPart = workbookPart.AddNewPart<WorkbookStylesPart>();
workbookStylesPart.Stylesheet = new Stylesheet();
workbookStylesPart.Stylesheet.Save();
// Make the columns in the worksheet
var columns = worksheetPart.Worksheet.GetFirstChild<Columns>();
bool needToInsertColumns = false;
if (columns == null)
{
columns = new Columns();
needToInsertColumns = true;
}
Column column1 = new Column() { CustomWidth = true, Width = 5};
columns.Append(column1);
// Insert the columns into the Worksheet
if (needToInsertColumns)
worksheetPart.Worksheet.InsertAt(columns, 0);
SheetData sheetData = worksheetPart.Worksheet.AppendChild(new SheetData());
Sheets sheets = workbookPart.Workbook.AppendChild(new Sheets());
Sheet sheet = new Sheet() { Id = workbookPart.GetIdOfPart(worksheetPart), SheetId = 1, Name = "Employees" };
sheets.Append(sheet);
workbookPart.Workbook.Save();
worksheetPart.Worksheet.Save();
document.Save();

Answer 1

I have tried the following and have success:
var columns = new Columns();
var column1 = new Column { Min = 1, Max = 1, Width = 5, CustomWidth = true };
var column2 = new Column { Min = 2, Max = 2, Width = 10, CustomWidth = true };
var column3 = new Column { Min = 3, Max = 3, Width = 5, CustomWidth = true };
var column4 = new Column { Min = 4, Max = 4, Width = 20, CustomWidth = true };
var column5 = new Column { Min = 5, Max = 5, Width = 50, CustomWidth = true };
columns.Append(column1);
columns.Append(column2);
columns.Append(column3);
columns.Append(column4);
columns.Append(column5);
worksheetPart.Worksheet.Append(columns);