Why not showing images from SQL?

public bool SaveDIBAs( string picname, IntPtr bminfo, IntPtr pixdat )
	{
		string  Partion=  @"h:\oucu\Student_Images\";
		string StName=St_num;
		string FullPath=Partion+StName;
		
 
		Guid clsid;
		if( ! GetCodecClsid( FullPath.ToString(), out clsid ) )
		{
			MessageBox.Show( "Unknown picture format for extension " + Path.GetExtension( FullPath.ToString() ),
				"Image Codec", MessageBoxButtons.OK, MessageBoxIcon.Information );
			return false;
		}
		
		IntPtr img = IntPtr.Zero;
		int st = GdipCreateBitmapFromGdiDib( bminfo, pixdat, ref img );
		if( (st != 0) || (img == IntPtr.Zero) )
			return false;
		
		textBox2.Text = FullPath.ToString() ;
		
		st = GdipSaveImageToFile( img,FullPath.ToString(), ref clsid, IntPtr.Zero );
		GdipDisposeImage( img );
		return st == 0;
		
	}
 
	public void ShowFrm()
	{
		this.Show();
	}

private void button1_Click(object sender, System.EventArgs e)
	{
        //St_num=stNTxt.Text ;
        St_num = StudentPhoto.photo.fileName;
		SaveDIBAs( this.Text, bmpptr, pixptr );
		byte[] byte_Img;
        
		//SqlConnection mySqlConn=new SqlConnection("Network Library=DBMSSOCN;"+"Data Source=82.201.143.224,2022;"+"Initial Catalog=oucu_card;"+"User ID=ousa;"+"Password=cO45_iu89");
        SqlConnection mySqlConn = new SqlConnection("server=192.168.1.25;workstation id=localhost;packet size=4096; persist security info=False;user id=araslan;Password=hR@oucu1;Initial catalog=mandoobeen;min pool size=1;max pool size=10000000;connection lifetime=6000");
		
		
		SqlCommand sqlcmd = new SqlCommand();
		sqlcmd.Connection=mySqlConn;
		sqlcmd.CommandText="insert into " + StudentPhoto.photo.tableName + " (nationalNumber,pictureName,Picture) values(@nN,@pN,@pic)";
		
		sqlcmd.Parameters.Add("@nN",System.Data.SqlDbType.NVarChar);				
		sqlcmd.Parameters.Add("@pic",System.Data.SqlDbType.Image);
		sqlcmd.Parameters.Add("@pN",System.Data.SqlDbType.NVarChar);
		
 
		FileStream fs=new FileStream(this.textBox2.Text.ToString(),FileMode.Open,FileAccess.Read,FileShare.Read);
		byte_Img=new byte[Convert.ToInt32(fs.Length)];
		int iBytesRead=fs.Read(byte_Img,0,Convert.ToInt32(fs.Length));
		fs.Close();
 
        sqlcmd.Parameters["@nN"].Value = StudentPhoto.photo.nationalNumber;
		sqlcmd.Parameters["@pic"].Value=byte_Img;
        TwainGui.Login l = new TwainGui.Login();
        sqlcmd.Parameters["@pN"].Value = StudentPhoto.photo.fileName;
 
		mySqlConn.Open();
		int iresult=sqlcmd.ExecuteNonQuery();
		mySqlConn.Close();
 
				
		System.Diagnostics.Process process1;
		process1= new System.Diagnostics.Process();
		process1.EnableRaisingEvents = false;
		Directory.SetCurrentDirectory(textBox3.Text);
        Application.Exit();
    }