LoadFromArrays
The LoadFromArrays method provides an easy way of loading an IEnumerable<object[]> into a range on a worksheet.
Overview
var list = new List<object[]> {
new object[] { 1, 2, 3 },
new object[] { 4, 5, 6 },
new object[] { 7, 8, 9 }
};
using var package = new ExcelPackage();
var sheet = package.Workbook.Worksheets.Add("Sheet 1");
var importedRange = sheet.Cells["A1"].LoadFromArrays(list);
Dim list = New List(Of Object()) From {
New Object() {1, 2, 3},
New Object() {4, 5, 6},
New Object() {7, 8, 9}
}
Using package As New ExcelPackage()
Dim sheet = package.Workbook.Worksheets.Add("Sheet 1")
Dim importedRange = sheet.Cells("A1").LoadFromArrays(list)
End Using

Transpose
You can also load the data transposed from an array by using the LoadFromArraysTransposed method.
See also