How to: Create a Named Range of Cells

using DevExpress.Spreadsheet;
// ...

IWorkbook workbook = spreadsheetControl1.Document;
Worksheet worksheet = workbook.Worksheets[0];

// Create a range.
Range rangeA2A4 = worksheet.Range["A2:A4"];
// Specify the name for the created range.
rangeA2A4.Name = "rangeA2A4";

// Create a new defined name with the specifed range name and absolute reference.
DefinedName definedName = worksheet.DefinedNames.Add("rangeC2D3", "Sheet1!$C$2:$D$3");
// Create a range using the specified defined name.
Range rangeC2D3 = worksheet.Range[definedName.Name];

Imports DevExpress.Spreadsheet
' ...

Dim workbook As IWorkbook = spreadsheetControl1.Document
Dim worksheet As Worksheet = workbook.Worksheets(0)

' Create a range.
Dim rangeA2A4 As Range = worksheet.Range("A2:A4")
' Specify the name for the created range.
rangeA2A4.Name = "rangeA2A4"

' Create a new defined name with the specifed range name and absolute reference.
Dim definedName As DefinedName = worksheet.DefinedNames.Add("rangeC2D3", "Sheet1!$C$2:$D$3")
' Create a range using the specified defined name.
Dim rangeC2D3 As Range = worksheet.Range(definedName.Name)