In this article, I am going to show how to read Excel file using c#. To achieve that we are going to use
Excel Data Reader (http://exceldatareader.codeplex.com/) DLL.
To get Excel Data Reader DLL to your project use NuGet

Code:

public void BtnUploadClick(object sender, EventArgs e)
        {
            string filePath = string.Empty;
            uploadPath = Server.MapPath("~/Excel/");            
                if (FileUpload1.HasFile)
                {
                    String fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
                    String validExt = sAllowedExt;
                    if (validExt.IndexOf("," + fileExtension + ",") != -1)
                    { 
                        if (FileUpload1.FileBytes.Length <= maxsize)
                        {
                            filePath = uploadPath + FileUpload1.FileName; 
                            FileUpload1.PostedFile.SaveAs(filePath); 
                            Response.Write("File uploaded successfully.");
 
                            FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read);
                            IExcelDataReader excelReader;
                            if (filePath.Contains(".xlsx"))
                            {
                                //2. Reading from a OpenXml Excel file (2007 format; *.xlsx)
                                excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream);
 
                            }  //...
                            else
                            {
                                //1. Reading from a binary Excel file ('97-2003 format; *.xls)
                                excelReader = ExcelReaderFactory.CreateBinaryReader(stream);
                            } //...
                            //3. DataSet - The result of each spreadsheet will be created in the result.Tables
                            //DataSet result = excelReader.AsDataSet();
                            //...
                            //4. DataSet - Create column names from first row
                            excelReader.IsFirstRowAsColumnNames = true;
                            DataSet result = excelReader.AsDataSet();
                            //5. Data Reader methods
                            //foreach (DataRow item in result.Tables[0].Rows)
                            //{
                            //    //item[1].ToString();
                            //}
                            GridView1.DataSource = result;
                            GridView1.DataBind();
                        }
                        else
                        {
                            Response.Write("File size exceeded the permitted limit.");
                            return;
                        }
                    }
                    else
                    {
                        Response.Write("This file type is not accepted.");
                        return;
                    }      
                }
        }

Thanks

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