how to display image in pictureBox

I mage from a Database
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Do not use an image field to your database at will occupy big space from your DB server. Change it to varchar instead and save the file name. With that, you can just retrieve the filename from the database and use it as source of image in your picture box.

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Best regards,
Eduard

Have a look at below article.

Storing and Retrieving Images from SQL Server using Microsoft .NET

1) Retrieve the image data from the database as an array of bytes.
2) Convert the bytes to an Image:

MemoryStream ms = new MemoryStream(bytes);
Image returnImage = Image.FromStream(ms);

3) Set the Image property of the Picture box to the converted data.

myPictureBox.Image = returnImage;

i tried .. but i got error.. guide me.. below my code

private void Form1_Load(object sender, EventArgs e)
        {
            cn.Open();
            cmd=new SqlCommand("select * from img where id=6",cn);
            cmd.Connection=cn;
            dr=cmd.ExecuteReader();
            byte bytes;
            
            while (dr.Read())
            {
                double dble = Convert.ToDouble(dr[2].ToString());
                bytes = Convert.ToByte(dble);
                MemoryStream ms = new MemoryStream(bytes);
                Image returnImage = Image.FromStream(ms);
                pictureBox1.Image = returnImage;
            
                
            }
            cn.Close();
        }

Don't retrieve the data as a double - a double is a floating point number occupying 8 bytes. And image (of any type) is going to be bigger than that!
You need to retrieve an array of bytes, not a single byte, so declare it as such.
In addition, don't use a loop there - since you are only using a single row, you only need an if statement.
BTW: Don't retrieve info from your database that you aren't going to use. In this case, it doesn't make a significant difference, but since you are storing images in the table, if you are not going to use them, don't retrieve them - it wastes bandwidth & memory and slows the program down, possibly significantly depending on where your SQL server is. And never use magic numbers with databases! If someone else comes along and re-orders the columns in your database, you code stops working and you don't know why! :laugh: Use names field access instead.
And remember - you are responsible for cleaning up after yourself! Dispose scarce connections or use a using block:
So:

private void Form1_Load(object sender, EventArgs e)
    {
        cn.Open();
        using (cmd=new SqlCommand("SELECT myImage FROM img WHERE id=6",cn))
        {
            cmd.Connection=cn;
            dr=cmd.ExecuteReader();
            if (dr.Read())
            {
                byte[] bytes = (byte[]) dr["myImage"];
                MemoryStream ms = new MemoryStream(bytes);
                Image returnImage = Image.FromStream(ms);
                pictureBox1.Image = returnImage;
            }
        }
        cn.Close();
    }