In this tutorial, I will teach you how to Upload and Read PDF File in VB.Net and MySQL Database. This Method will help you Upload the file in the database and view it into the Adobe PDF Reader.This is a step by step guide and it's very easy to learn.
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Before we start:
Create a database named "test".

1. Create
   
   database
   
   test
   

Create a table in the database that you have created.

1. CREATE
   
   TABLE
   
   `test`
   
   .`tblfiles`
   
   (
   
   `FileId`
   
   INT
   
   NOT
   
   NULL
   
   AUTO_INCREMENT
   
   ,
   
   `FileName`
   
   TEXT
   
   NOT
   
   NULL
   
   ,
   
   PRIMARY KEY
   
   (
   
   `FileId`
   
   )
   
   )
   
   ENGINE
   
   =
   
   InnoDB
   
   ;
   

Lets begin:
Step 1

Open Microsoft Visual Studio 2015 and create a new windows form application. After that, do the following form just like shown below.

Step 2

Add another form and add PDF Reader inside the form.


Step 3

In the Form1, double click the Browse button to fire the click event handler

and do the following code for finding the PDF file.

1. Try
   
2. OpenFileDialog1.Filter = "PDF | *.pdf"
   
3. If
   
   OpenFileDialog1.ShowDialog = DialogResult.OK Then
   
4. TextBox1.Text = OpenFileDialog1.FileName
   
5. End
   
   If
   
6. Catch ex As
   
   Exception
   
7. MsgBox(ex.Message)
   
8. End
   
   Try
   

Step 4

Set the imports above the Public Class.

1. Imports MySql.Data.MySqlClient
   

Step 5

Initialize all the classes that are needed.

1. Dim
   
   con As
   
   MySqlConnection = New
   
   MySqlConnection("server=localhost;user id=root;password=janobe;database=test;sslMode=none"
   
   )
   
2. Dim
   
   cmd As
   
   MySqlCommand
   
3. Dim
   
   da As
   
   MySqlDataAdapter
   
4. Dim
   
   dt As
   
   DataTable
   
5. Dim
   
   sql As
   
   String
   

Step 6

Do the following code for retrieving data from the database to the datagridview.

1. Private
   
   Sub
   
   Form1_Load(sender As
   
   Object
   
   , e As
   
   EventArgs) Handles MyBase.Load
   
2. Try
   
3. con.Open
   
   ()
   
4. sql = "SELECT * FROM tblfiles"
   
5. cmd = New
   
   MySqlCommand
   
6. With
   
   cmd
   
7. .Connection = con
   
8. .CommandText = sql
   
9. End
   
   With
   
10. da = New
    
    MySqlDataAdapter
    
11. dt = New
    
    DataTable
    
12. da.SelectCommand = cmd
    
13. da.Fill(dt)
    
14. 
    
15. DataGridView1.DataSource = dt
    
16. 
    
17. Catch ex As
    
    Exception
    
18. MsgBox(ex.Message)
    
19. Finally
    
20. da.Dispose()
    
21. con.Close
    
    ()
    
22. End
    
    Try
    
23. End
    
    Sub
    

Step 7

Go back to the design view (Form1), double click the timer to fire the tick event handler

of it and do the following code for uploading pdf file in the database.

1. Try
   
2. ProgressBar1.Value += 1
   
3. If
   
   ProgressBar1.Value = 100 Then
   
4. Timer1.Stop
   
   ()
   
5. 
   
6. con.Open
   
   ()
   
7. sql = "INSERT INTO `tblfiles` (`FileName`) VALUES ('"
   
   & System.IO.Path.GetFileName(TextBox1.Text) & "')"
   
8. 
   
9. cmd = New
   
   MySqlCommand
   
10. With
    
    cmd
    
11. .Connection = con
    
12. .CommandText = sql
    
13. .ExecuteNonQuery()
    
14. End
    
    With
    
15. 
    
16. If
    
    TextBox1.Text <> ""
    
    Then
    
17. System.IO.File.Copy(TextBox1.Text, Application.StartupPath & "\PDF_Files\"
    
    & System.IO.Path.GetFileName(TextBox1.Text), True
    
    )
    
18. End
    
    If
    
19. MsgBox("Scanned file uploaded successfully."
    
    )
    
20. 
    
21. 
    
22. TextBox1.Clear()
    
23. ProgressBar1.Value = 0
    
24. End
    
    If
    
25. 
    
26. Catch ex As
    
    Exception
    
27. MsgBox(ex.Message)
    
28. Finally
    
29. con.Close
    
    ()
    
30. End
    
    Try
    
31. 'call to retrieve file
    
32. Call
    
    Form1_Load(sender, e)
    

Step 8

Go back to the design view (Form1) again, double click the Upload button to fire click event handler

and set the timer to start.

1. Timer1.Start()
   

Step 9

Double click the View button to fire the click event handler

and do the following code to view the uploaded pdf file.

1. Try
   
2. con.Open
   
   ()
   
3. sql = "SELECT * FROM tblfiles WHERE FileId="
   
   & DataGridView1.CurrentRow.Cells(0).Value
   
4. cmd = New
   
   MySqlCommand
   
5. With
   
   cmd
   
6. .Connection = con
   
7. .CommandText = sql
   
8. End
   
   With
   
9. da = New
   
   MySqlDataAdapter
   
10. dt = New
    
    DataTable
    
11. da.SelectCommand = cmd
    
12. da.Fill(dt)
    
13. 
    
14. With
    
    Form2
    
15. .Show()
    
16. .Focus()
    
17. .AxAcroPDF1.src = Application.StartupPath & "\PDF_Files\"
    
    & dt.Rows(0).Item("FileName"
    
    )
    
18. End
    
    With
    
19. Catch ex As
    
    Exception
    
20. MsgBox(ex.Message)
    
21. Finally
    
22. da.Dispose()
    
23. con.Close
    
    ()
    
24. End
    
    Try
    

Note: add mysql.data.dll

for the references to access MySQL Library
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The complete sourcecode is included. You can download it and run it on your computer.
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For more question about this article. You can contact me @
Email – [email protected]
Mobile No. – 09305235027 – TNT
FB Account – https://www.facebook.com/onnaj.soicalap

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