How to properly set Column Width upon creating Excel file? (Column properties)

I normally do this in VB and its easier because Excel records macros in VB. So I normally go to Excel and save the macro I want to do.

So that’s what I did now and I got this code:

Columns("E:E").ColumnWidth = 17.29;

Range("E3").Interior.Pattern = xlSolid;
Range("E3").Interior.PatternColorIndex = xlAutomatic;
Range("E3").Interior.Color = 65535;
Range("E3").Interior.TintAndShade = 0;
Range("E3").Interior.PatternTintAndShade = 0;

I think you can do something like this:

xlWorkSheet.Columns[5].ColumnWidth = 18;

For your last question what you need to do is loop trough the columns you want to set their width:

for (int i = 1; i <= 10; i++) // this will apply it from col 1 to 10
{
    xlWorkSheet.Columns[i].ColumnWidth = 18;
}

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