C#

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public Form1()
       {
           ExcelDataSource myExcelSource = new ExcelDataSource();
           myExcelSource.FileName = @"C:\Users\Fardin\Desktop\Book1.xlsx";
           ExcelWorksheetSettings worksheetSettings = new ExcelWorksheetSettings("Sheet1", "A1:B20");
           myExcelSource.SourceOptions = new ExcelSourceOptions(worksheetSettings);
           myExcelSource.SourceOptions.SkipEmptyRows = false;
           myExcelSource.SourceOptions.UseFirstRowAsHeader = true;
           myExcelSource.Fill();
           pivotGridControl1.DataSource = myExcelSource;
       }

System.NullReferenceException: 'Object reference not set to an instance of an object.'