Save Store Files In Sql Database Download From GridView Asp.Net

Upload Save Or Store Files In Ms Sql Server Database And Download In Asp.Net.

In this post i'm explaining how to save pdf,word,excel,jpeg,gif,png files in MS sqlserver database .

I'll also explain how to download files from sql database.

For this example i have created a sample database with table nameSaveDoc to save documents in it. table schema is shown below in image.

Read Display Images In GridView From SqlServer DataBase Asp.Net to know how to save and retrieve images in sql database and display them in gridview using handler.

For uploading and saving files to database we need to use Fileupload control, so drag and place one fileupload control and one button on the aspx page in design mode.

Place one label on the page to display success or failure message, and one gridview to display uploaded documents and provide link to download document files.

I have added one button field in gridview to provide download link to file shown in respective row of gridview and this gridview is populated by sqlDataSource.

HTML SOURCE OF THE PAGE

<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server"/>
<asp:Button ID="btnUpload" runat="server"  
            onclick="btnUpload_Click" 
            Text="Upload"/>
</div>
<br/>
<asp:Label ID="lblMessage" runat="server">
</asp:Label><br /><br /><br />
      
<asp:GridView ID="GridView1" runat="server" 
              AutoGenerateColumns="False" 
              DataSourceID="SqlDataSource1" 
              onrowcommand="GridView1_RowCommand" 
              DataKeyNames="DocID">
<Columns>
<asp:BoundField DataField="DocID" HeaderText="DocID" 
                InsertVisible="False" 
                ReadOnly="True" 
                SortExpression="DocID" />

<asp:BoundField DataField="DocName" 
                HeaderText="DocName" 
                SortExpression="DocName" />

<asp:BoundField DataField="Type" HeaderText="Type" 
                SortExpression="Type" />
            
<asp:ButtonField ButtonType="Image"  
                ImageUrl="~/download.png" 
                CommandName="Download" 
                HeaderText="Download" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
SelectCommand="SELECT [DocID], [DocName], [Type] 
               FROM [SaveDoc]">
</asp:SqlDataSource>
</form>

To upload and save files in database write code mentioned below in Click event of upload button we placed on aspx page.

C# CODE

01using System.IO;

02using System.Data;

03using System.Data.SqlClient;

04using System.Configuration;

05 

06protected void btnUpload_Click(object sender, EventArgs e)

07    {

08        //Check whether FileUpload control has file

09        if (FileUpload1.HasFile)

10        {

11            string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);

12            string fileExtension = Path.GetExtension(FileUpload1.PostedFile.FileName);

13            string documentType = string.Empty;

14 

15            //provide document type based on it's extension

16            switch (fileExtension)

17            {

18                case ".pdf":

19                    documentType = "application/pdf";

20                    break;

21                case ".xls":

22                    documentType = "application/vnd.ms-excel";

23                    break;

24                case ".xlsx":

25                    documentType = "application/vnd.ms-excel";

26                    break;

27                case ".doc":

28                    documentType = "application/vnd.ms-word";

29                    break;

30                case ".docx":

31                    documentType = "application/vnd.ms-word";

32                    break;

33                case ".gif":

34                    documentType = "image/gif";

35                    break;

36                case ".png":

37                    documentType = "image/png";

38                    break;

39                case ".jpg":

40                    documentType = "image/jpg";

41                    break;

42            }

43 

44            //Calculate size of file to be uploaded

45            int fileSize = FileUpload1.PostedFile.ContentLength;

46 

47            //Create array and read the file into it

48            byte[] documentBinary = new byte[fileSize];

49            FileUpload1.PostedFile.InputStream.Read(documentBinary, 0, fileSize);

50 

51            // Create SQL Connection

52            SqlConnection con = new SqlConnection();

53            con.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

54 

55            // Create SQL Command and Sql Parameters

56            SqlCommand cmd = new SqlCommand();

57            cmd.CommandText = "INSERT INTO SaveDoc(DocName,Type,DocData)" +

58                              " VALUES (@DocName,@Type,@DocData)";

59            cmd.CommandType = CommandType.Text;

60            cmd.Connection = con;

61 

62            SqlParameter DocName = new SqlParameter("@DocName", SqlDbType.VarChar, 50);

63            DocName.Value = fileName.ToString();

64            cmd.Parameters.Add(DocName);

65 

66            SqlParameter Type = new SqlParameter("@Type", SqlDbType.VarChar, 50);

67            Type.Value = documentType.ToString();

68            cmd.Parameters.Add(Type);

69 

70            SqlParameter uploadedDocument = new SqlParameter("@DocData", SqlDbType.Binary,fileSize);

71            uploadedDocument.Value = documentBinary;

72            cmd.Parameters.Add(uploadedDocument);

73 

74            con.Open();

75            int result = cmd.ExecuteNonQuery();

76            con.Close();

77            if (result > 0)

78                lblMessage.Text = "File saved to database";

79            GridView1.DataBind();

80        }

81    }

VB.NET CODE

01Protected Sub btnUpload_Click(sender As Object, e As EventArgs)

02 'Check whether FileUpload control has file

03 If FileUpload1.HasFile Then

04  Dim fileName As String = Path.GetFileName(FileUpload1.PostedFile.FileName)

05  Dim fileExtension As String = Path.GetExtension(FileUpload1.PostedFile.FileName)

06  Dim documentType As String = String.Empty

07 

08  'provide document type based on it's extension

09  Select Case fileExtension

10   Case ".pdf"

11    documentType = "application/pdf"

12    Exit Select

13   Case ".xls"

14    documentType = "application/vnd.ms-excel"

15    Exit Select

16   Case ".xlsx"

17    documentType = "application/vnd.ms-excel"

18    Exit Select

19   Case ".doc"

20    documentType = "application/vnd.ms-word"

21    Exit Select

22   Case ".docx"

23    documentType = "application/vnd.ms-word"

24    Exit Select

25   Case ".gif"

26    documentType = "image/gif"

27    Exit Select

28   Case ".png"

29    documentType = "image/png"

30    Exit Select

31   Case ".jpg"

32    documentType = "image/jpg"

33    Exit Select

34  End Select

35 

36  'Calculate size of file to be uploaded

37  Dim fileSize As Integer = FileUpload1.PostedFile.ContentLength

38 

39  'Create array and read the file into it

40  Dim documentBinary As Byte() = New Byte(fileSize - 1) {}

41  FileUpload1.PostedFile.InputStream.Read(documentBinary, 0, fileSize)

42 

43  ' Create SQL Connection

44  Dim con As New SqlConnection()

45  con.ConnectionString = ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString

46 

47  ' Create SQL Command and Sql Parameters

48  Dim cmd As New SqlCommand()

49  cmd.CommandText = "INSERT INTO SaveDoc(DocName,Type,DocData)" & " VALUES (@DocName,@Type,@DocData)"

50  cmd.CommandType = CommandType.Text

51  cmd.Connection = con

52 

53  Dim DocName As New SqlParameter("@DocName", SqlDbType.VarChar, 50)

54  DocName.Value = fileName.ToString()

55  cmd.Parameters.Add(DocName)

56 

57  Dim Type As New SqlParameter("@Type", SqlDbType.VarChar, 50)

58  Type.Value = documentType.ToString()

59  cmd.Parameters.Add(Type)

60 

61  Dim uploadedDocument As New SqlParameter("@DocData", SqlDbType.Binary, fileSize)

62  uploadedDocument.Value = documentBinary

63  cmd.Parameters.Add(uploadedDocument)

64 

65  con.Open()

66  Dim result As Integer = cmd.ExecuteNonQuery()

67  con.Close()

68  If result > 0 Then

69   lblMessage.Text = "File saved to database"

70  End If

71  GridView1.DataBind()

72 End If

73End Sub

To retrieve files from database for download in click of download button we put in gridview, we need to write code mentioned below in RowCommand Event of gridview

c# CODE

01protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)

02    {

03        if (e.CommandName == "Download")

04        {

05            string fileName = string.Empty;

06            int index = Convert.ToInt32(e.CommandArgument);

07            GridViewRow row = GridView1.Rows[index];

08            int documentID = Convert.ToInt32(GridView1.DataKeys[index].Value);

09            SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);

10            SqlCommand cmd = new SqlCommand("SELECT DocName,DocData FROM SaveDoc WHERE DocID = " + documentID, con);

11            con.Open();

12            SqlDataReader dReader = cmd.ExecuteReader();

13            while (dReader.Read())

14            {

15                fileName = dReader["DocName"].ToString();

16                byte[] documentBinary = (byte[])dReader["DocData"];

17                FileStream fStream = new FileStream(Server.MapPath("Docs") + @"\" + fileName, FileMode.Create);

18                fStream.Write(documentBinary, 0, documentBinary.Length);

19                fStream.Close();

20                fStream.Dispose();

21            }

22            con.Close();

23            Response.Redirect(@"Docs\" + fileName);

24        }

25    }

VB.NET CODE

01Protected Sub GridView1_RowCommand(sender As Object, e As GridViewCommandEventArgs)

02 If e.CommandName = "Download" Then

03  Dim fileName As String = String.Empty

04  Dim index As Integer = Convert.ToInt32(e.CommandArgument)

05  Dim row As GridViewRow = GridView1.Rows(index)

06  Dim documentID As Integer = Convert.ToInt32(GridView1.DataKeys(index).Value)

07  Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString)

08  Dim cmd As New SqlCommand("SELECT DocName,DocData FROM SaveDoc WHERE DocID = " & documentID, con)

09  con.Open()

10  Dim dReader As SqlDataReader = cmd.ExecuteReader()

11  While dReader.Read()

12   fileName = dReader("DocName").ToString()

13   Dim documentBinary As Byte() = DirectCast(dReader("DocData"), Byte())

14   Dim fStream As New FileStream(Server.MapPath("Docs") & "\" & fileName, FileMode.Create)

15   fStream.Write(documentBinary, 0, documentBinary.Length)

16   fStream.Close()

17   fStream.Dispose()

18  End While

19  con.Close()

20  Response.Redirect("Docs\" & fileName)

21 End If

22End Sub