You can try the below:
string path = fileuploadExcel.PostedFile.FileName;
string excelConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;Persist Security Info=False";
InsertExceldata(excelConnectionString);
}
In InsertExceldata method do what you desire with the imported data.