How to get count of column from excel sheet

using Excel = Microsoft.Office.Interop.Excel;  
  
Excel.Application xlApp     = null;  
Excel.Workbook wb           = null;  
Excel.Worksheet worksheet   = null;  
int lastUsedRow             = 0;  
int lastUsedColumn          = 0;  
string srcFile              = @"Path to your XLSX file";  
  
xlApp = new Excel.ApplicationClass();  
xlApp.Visible = false;  
wb = xlApp.Workbooks.Open(srcFile,  
                               0, false, 5, "", "", false, Excel.XlPlatform.xlWindows, "",  
                               true, false, 0, true, false, false);  
  
worksheet = (Excel.Worksheet)wb.Worksheets[1];  
Excel.Range range  
  
// Find the last real row  
lastUsedRow = worksheet.Cells.Find("*",System.Reflection.Missing.Value,   
                               System.Reflection.Missing.Value, System.Reflection.Missing.Value,   
                               Excel.XlSearchOrder.xlByRows,Excel.XlSearchDirection.xlPrevious,   
                               false,System.Reflection.Missing.Value,System.Reflection.Missing.Value).Row;  
  
// Find the last real column  
lastUsedColumn = worksheet.Cells.Find("*", System.Reflection.Missing.Value,   
                               System.Reflection.Missing.Value,System.Reflection.Missing.Value,   
                               Excel.XlSearchOrder.xlByColumns,Excel.XlSearchDirection.xlPrevious,   
                               false,System.Reflection.Missing.Value,System.Reflection.Missing.Value).Column;  
  
xlApp.Workbooks.Close();  
xlApp.Quit();  
  
Marshal.ReleaseComObject(worksheet);  
Marshal.ReleaseComObject(wb);  
Marshal.ReleaseComObject(xlApp);  
 Hope this helps you...