Asp.net and C#.net Tips: 09/01/2011

Here I am going to show you the step by step process to import data from Excel to SQL Server. To do so follow the below steps :

Step:1 Create Sample Table.

 GO  
 CREATE TABLE [dbo].[Product_Master](  
   [Product_Code] [varchar](20) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,  
   [Product_Name] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,  
   [Price] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL  
 ) ON [PRIMARY]  
 GO

Step:2 Create New Web site with new webpage named as Default.aspx (Following is the code contained in the Default.aspx page).

1:  <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>  
2:  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
3:  <html xmlns="http://www.w3.org/1999/xhtml">  
4:  <head runat="server">  
5:    <title>Import Excel Data To SQL Server</title>  
6:  </head>  
7:  <body>  
8:    <form id="form1" runat="server">  
9:    <div>  
10:      <asp:Label ID="lblHeading" runat="server" Text="Select File To Upload : "></asp:Label>  
11:      <asp:FileUpload ID="FileUpload1" runat="server" />  
12:      <br />  
13:      <br />  
14:      <asp:Button ID="btnUpload" runat="server" Text="Upload"   
15:        onclick="btnUpload_Click" />     
16:      <asp:Button ID="btnSaveToDB" runat="server" Text="Save To DB"   
17:        onclick="btnSaveToDB_Click" />  
18:        <br /><br />  
19:      <asp:Label ID="lblerror" runat="server" ForeColor ="Red" Text=""></asp:Label>  
20:    </div>  
21:    </form>  
22:  </body>  
23:  </html>

Step:3 Here is the C# code of the Default.aspx.cs file:

1:  using System;  
2:  using System.Configuration;  
3:  using System.Data;  
4:  using System.Linq;  
5:  using System.Web;  
6:  using System.Web.Security;  
7:  using System.Web.UI;  
8:  using System.Web.UI.HtmlControls;  
9:  using System.Web.UI.WebControls;  
10:  using System.Web.UI.WebControls.WebParts;  
11:  using System.Xml.Linq;  
12:  using System.IO;  
13:  public partial class _Default : System.Web.UI.Page   
14:  {  
15:    protected void Page_Load(object sender, EventArgs e)  
16:    {  
17:    }  
18:    protected void btnUpload_Click(object sender, EventArgs e)  
19:    {  
20:      if (FileUpload1.HasFile)  
21:      {  
22:        var uploadFile = new UploadFile(FileUpload1.FileName);  
23:        try  
24:        {  
25:          FileUpload1.SaveAs(uploadFile.SavePath);  
26:        }  
27:        catch (Exception ex)  
28:        {  
29:          lblerror.Text = "error : "+ex.Message;  
30:        }  
31:       }  
32:    }  
33:    protected void btnSaveToDB_Click(object sender, EventArgs e)  
34:    {  
35:      ImportDataIntoDB idid = new ImportDataIntoDB();  
36:      string count = idid.saveDataToDB();  
37:      if (Convert.ToInt16(count) < 0)  
38:      {  
39:        lblerror.Text = "Error Occurred...";  
40:      }  
41:      UploadFile upFile = new UploadFile();  
42:      upFile.DeleteFileNoException();  
43:    }  
44:  }

Step:4 In this i call the UploadFile class which is created in a separate class file. This class is used to store uploaded file and also used to generate OleDb connection string as per file selected. Here is the code of UploadFile Class :

1:  using System;  
2:  using System.Data;  
3:  using System.Configuration;  
4:  using System.Linq;  
5:  using System.Web;  
6:  using System.Web.Security;  
7:  using System.Web.UI;  
8:  using System.Web.UI.HtmlControls;  
9:  using System.Web.UI.WebControls;  
10:  using System.Web.UI.WebControls.WebParts;  
11:  using System.Xml.Linq;  
12:  using System.IO;  
13:  ///   
14:  /// Summary description for UploadFile  
15:  ///   
16:  public class UploadFile  
17:  {  
18:    private string savePath;  
19:    public UploadFile()  
20:    {  
21:    }  
22:    public UploadFile(string originalFileName)  
23:    {  
24:      string tempFileName = Guid.NewGuid().ToString("N") + "_" + originalFileName;  
25:      string saveLocation = HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["FileUploadLocation"]);  
26:      savePath = Path.Combine(saveLocation, tempFileName);  
27:      HttpContext.Current.Session["savePath"] = savePath;  
28:    }  
29:    ///   
30:    /// Temp path used to save the uploaded file  
31:    ///   
32:    public string SavePath  
33:    {  
34:      get  
35:      {  
36:        return savePath;  
37:      }  
38:    }  
39:    ///   
40:    /// Attempt to delete temp file  
41:    ///   
42:    public void DeleteFileNoException()  
43:    {  
44:      savePath = HttpContext.Current.Session["savePath"].ToString();  
45:      if (File.Exists(savePath))  
46:      {  
47:        try  
48:        {  
49:          File.Delete(savePath);  
50:        }  
51:        catch { }  
52:      }  
53:    }  
54:    ///   
55:    /// Return connection strinng based on file extension  
56:    ///   
57:    public string GetOleDbConnectionString()  
58:    {  
59:      savePath = HttpContext.Current.Session["savePath"].ToString();  
60:      var finfo = new FileInfo(savePath);  
61:      if (!finfo.Exists)  
62:      {  
63:        throw new FileNotFoundException(savePath);  
64:      }  
65:      var fileExtension = finfo.Extension.ToLower();  
66:      switch (fileExtension)  
67:      {  
68:        case ".xls":  
69:          return string.Format(ConfigurationManager.AppSettings["xlsOleDBConnection"], savePath);  
70:        case ".xlsx":  
71:          return string.Format(ConfigurationManager.AppSettings["xlsxOleDBConnection"], savePath);  
72:        default:  
73:          throw new NotSupportedException(String.Format("This file type {0} is not supported!", fileExtension));  
74:      }  
75:    }  
76:  }

Step:5 Now next step is read that file and save the data into sql server. Here is the method which reads the data from excel and save it into sql server database :

1:  public string saveDataToDB()  
2:    {  
3:      int j = 0;  
4:      string strQuery = "SELECT ProductCode,ProductName,ItemCaptionJP,ItemTextJP,IngredientsJP,CountryOfOrigin,HowToStore FROM [Sheet1$]";  
5:      DataTable dt = new DataTable();  
6:      OleDbCommand ocmd = new OleDbCommand(strQuery, oleconn);  
7:      //OleDbDataAdapter da = new OleDbDataAdapter(strQuery, oleconn);  
8:      oleconn.Open();  
9:      OleDbDataReader odr = ocmd.ExecuteReader();  
10:      int i = 0;  
11:      if (odr.HasRows)  
12:      {  
13:        while (odr.Read())  
14:        {  
15:          if (i == 0)  
16:            sb.Append("UPDATE Product_Master set [itemCaption_jp]=N'" + odr["ItemCaptionJP"] + "',[itemText_jp]=N'" + odr["ItemTextJP"].ToString() + "',[ingredients_jp]=N'" + odr["IngredientsJP"].ToString() + "',[countryoforigin_jp]=N'" + odr["CountryOfOrigin"].ToString() + "',[howtostore_jp]=N'" + odr["HowToStore"].ToString() + "' where [alternate_code]='" + odr["ProductCode"].ToString() + "' and Product_Name='" + odr["ProductName"].ToString() + "'");  
17:          else  
18:            sb.Append(";UPDATE Product_Master set [itemCaption_jp]=N'" + odr["ItemCaptionJP"] + "',[itemText_jp]=N'" + odr["ItemTextJP"].ToString() + "',[ingredients_jp]=N'" + odr["IngredientsJP"].ToString() + "',[countryoforigin_jp]=N'" + odr["CountryOfOrigin"].ToString() + "',[howtostore_jp]=N'" + odr["HowToStore"].ToString() + "' where [alternate_code]='" + odr["ProductCode"].ToString() + "' and Product_Name='" + odr["ProductName"].ToString() + "'");  
19:          i++;  
20:        }  
21:        j = UpdatedCommand(sb.ToString());  
22:      }  
23:      return j.ToString();  
24:    }  
25:    #region update,delete,insert data in Database  
26:    public int UpdatedCommand(string strupdatequery)  
27:    {  
28:      int intreturn = 0;  
29:      ClientScriptManager cs = Page.ClientScript;  
30:      Type ty = this.GetType();  
31:      try  
32:      {  
33:        SqlCommand cmdupdatecommand = new SqlCommand();  
34:        transsql = null;  
35:        if (sqlconn.State != ConnectionState.Closed)  
36:        {  
37:          sqlconn.Close();  
38:        }  
39:        sqlconn.Open();  
40:        transsql = sqlconn.BeginTransaction();  
41:        cmdupdatecommand.CommandTimeout = 0;  
42:        cmdupdatecommand.CommandText = strupdatequery;  
43:        cmdupdatecommand.Connection = sqlconn;  
44:        cmdupdatecommand.Transaction = transsql;  
45:        intreturn = cmdupdatecommand.ExecuteNonQuery();  
46:        transsql.Commit();  
47:        if (sqlconn.State != ConnectionState.Closed)  
48:        {  
49:          sqlconn.Close();  
50:        }  
51:        return intreturn;  
52:      }  
53:      catch (SqlException oleex)  
54:      {  
55:        transsql.Rollback();  
56:        strupdatequery = oleex.Message;  
57:        strerorrmsg1 = "Error In UpdatedCommand method " + oleex.Message.ToString();  
58:        strerorrmsg2 = strerorrmsg1.Replace("'", "");  
59:        string msg = "alert('" + strerorrmsg2 + "');";  
60:        cs.RegisterStartupScript(ty, strerorrmsg1, msg, true);  
61:        return -3;  
62:      }  
63:      catch (System.Exception exp)  
64:      {  
65:        transsql.Rollback();  
66:        strupdatequery = exp.Message;  
67:        strerorrmsg1 = "Error In UpdatedCommand method " + exp.Message.ToString();  
68:        strerorrmsg2 = strerorrmsg1.Replace("'", "");  
69:        string msg = "alert('" + strerorrmsg2 + "');";  
70:        cs.RegisterStartupScript(ty, strerorrmsg1, msg, true);  
71:        return -3;  
72:      }  
73:      finally  
74:      {  
75:        if (sqlconn.State != ConnectionState.Closed)  
76:        {  
77:          sqlconn.Close();  
78:        }  
79:      }  
80:    }  
81:    #endregion

Asp.net is a awesome framework developing web sites and web applications.with visual studio asp.net become cooler and cooler. I have wrote an article Visual Studio 2010 New Tips and Shortcut previously. now I thought to write for asp.net tips and tricks because as the way you are using the framework it’ll be hard or easier to understand and do some work with minimum codes.
Ok here we go we’ll see what are the cool features offer asp.net for .net web developers.

1. Maintain the position of scrollbar on postback : since asp.net 1.1 it was a very hard to maintain the position of scrollbar when doing postback. it’s was very necessary feature when we edit some data and after submit find position that we were editing. In asp.net 2.0 you can simply add the MantainScrollPositionOnPostBack attribute to the page directive.

<%@ Page Language="C#" MaintainScrollPositionOnPostback="true" AutoEventWireup="true" CodeFile="..." Inherits="..." %>

2. Set Default Button for form when user hit the enter key : In asp.net 1.1 required to write javascript to set default key for when form submit after hit Enter key. fortunatly you can use HtmlForcontrol’s DefaultButton property to set which button should be clicked when the user hit the enter

<form id="frm" DefaultButton="btnSubmit" runat="server">

...

</form>

3. Set the default focus to control when page loads : as mention above also we can set default focus for page load like below

<form id="frm" DefaultFocus="txtUserName" runat="server">

...

</form>

4. Strongly type access to the cross-page postbacks : asp.net 2.0 introduced the concept of cross page post back where one page could post back information to another page.if you add public property in to code behind page that initiate the postback operation, you can access property in strong type manner by adding PreviouPageType directive in to target page of the post back.
<%@ PreviousPageType VirtualPath="Default.aspx" %>

by adding this directive to pageyou can access the TextBox defind in previous page in strongly type manner.

TextBox tb = PreviousPage.SearchTextBox;

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