OpenFileDialog openFileDialog1 = new OpenFileDialog();
if(openFileDialog1.ShowDialog() == DialogResult.OK)
{
     if((myStream = openFileDialog1.OpenFile())!= null);
       {
            byte[] buf = new byte[myStream.Length];
            myStream.Read(buf,  0 , (int)myStream.Length);
            myStream.Close();
            OdbcConnection sqlConnection1 = new OdbcConnection(MyConString);

            String insertCmd = "INSERT INTO imagetest (image) (@pic)";
 
            OdbcCommand myCommand = new OdbcCommand(insertCmd, sqlConnection1);
            myCommand.Parameters.Add(new OdbcParameter("@pic", OdbcType.Image));
            myCommand.Parameters["@pic"].Value = buf;
            myCommand.Connection.Open();
            myCommand.ExecuteNonQuery();
            myCommand.Connection.Close();
        }
}

byte[] buf = new byte[myStream.Length];
myStream.Read(buf,  0 , (int)myStream.Length);
myStream.Close();
OdbcConnection sqlConnection1 = new OdbcConnection(MyConString);
String insertCmd = "INSERT INTO imagetest set image = ?";
OdbcCommand myCommand = new OdbcCommand(insertCmd, sqlConnection1);
OdbcParameter img = new OdbcParameter();
img.OdbcType = OdbcType.Image;
img.Value = buf;
myCommand.Parameters.Add(img);
myCommand.Connection.Open();
myCommand.ExecuteNonQuery();
myCommand.Connection.Close();