How to display a image from access database to picturebox

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im trying to display image from any access database to a picturebox1 but picturebox1 is empty not showning anything is what im doing right or there other way to do it

What I have tried:

C#

OleDbConnection cn = new OleDbConnection();
string a = textBox5.Text;
string b = textBox6.Text;
string c = textBox7.Text;
cn.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + a;
OleDbCommand cmd = new OleDbCommand();

cn.Open();



cmd.Connection = cn;


cmd.CommandText = "Select "+c+"  from "+b+" where y="+label9.Text;
OleDbDataReader reader = cmd.ExecuteReader();

DataTable tbl = new DataTable();
DataRow drw;
for (int i = 1; i < tbl.Rows.Count -1; i++)
{
    drw = tbl.Rows[i];
    Byte[] content = new Byte[0];
    content = (Byte[])(drw["image"]);
    MemoryStream stream = new MemoryStream(content);
    pictureBox1.Image = Image.FromStream(stream);
}
while (reader.Read())
{

    label1.Text = reader.GetString(reader.GetOrdinal("name"));


}


cn.Close();

Posted 26-Oct-19 4:57am

Member 14630006

Updated 26-Oct-19 8:27am

Nelek

v2

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RickZeeland · Answer 1 · 2019-10-26T05:07:00

Solution 1

See example here: Reading and writing images to MS-Access 2007 and higher databases in C#, VB.NET for Visual Studio 2017[^]

Posted 26-Oct-19 5:07am

RickZeeland

OriginalGriff · Answer 2 · 2019-10-26T05:12:00

Don't do it like that! Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

Which SQL sees as three separate commands:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';

A perfectly valid SELECT

SQL

DROP TABLE MyTable;

A perfectly valid "delete the table" command

SQL

--'

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?

When you have fixed that throughout your app, start looking at this - but look closely at what you are doing. Where do you get the image data from? tbl is a new DataTable - it contains no rows, so the count will always be zero.
You don't do anything useful with your DataReader, either!

And please, do yourself a favour: stop using Visual Studio default names for everything - you may remember that "TextBox8" is the mobile number today, but when you have to modify it in three weeks time, will you then? Use descriptive names - "tbMobileNo" for example - and your code becomes easier to read, more self documenting, easier to maintain - and surprisingly quicker to code because Intellisense can get to to "tbMobile" in three keystrokes, where "TextBox8" takes thinking about and 8 keystrokes...