Removing duplicate values in a column in devepress spreadsheet

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C#

DevEpress Spreadsheet doesn't currently support "Remove Duplicate" function. I want to write a C# code to do this manually. I have a column of values. Some of them are duplicate and those duplicate values may or may not be adjacent. I want to remove corresponding row of duplicate values.
I tried my own code but it doesn't work properly.
Hoe can I get desired result?

What I have tried:

IWorkbook workbook = spreadsheetControl.Document;
           Worksheet worksheet = workbook.Worksheets["Sheet1"];
           CellRange range = worksheet.GetUsedRange();
           int LastRow = range.BottomRowIndex;
           //MessageBox.Show(Convert.ToString(LastRow));
           for (int i = 0; i < LastRow; i++)
           {
               for (int n = 1; n < LastRow; n++)
               {
                   if (worksheet.Cells[i,0].Value == worksheet.Cells[i+n,0].Value)
                   {
                       worksheet.Rows[n].Delete();
                   }
               }
           }