this.Refresh(); problem in C#


  • hi there.


    i am developing a windows application in C#.

    i am facing the form controls lock problem. when we fill images in picture box by loop.

    like that


    for (var1 = 0; var1 < this.trackBar1.Maximum; var1 = var1 + 10)





    this.pictureBox1.Image = FrameGrabber.GetFrameFromVideo(this.textBox1.Text, (var1) / this.trackBar1.Maximum);


    thanks in advance


    Friday, November 14, 2008 11:05 AM


  • Hi Dheeraj mittal,


    I guess you were using the third party Dlls to get frame from the video files, and displayed the returned bitmaps in the PictureBox contro. Actually, I didn’t reproduce your problems which you said controls locked. However, with your code, only one picture can be seen even you use a “for statement”.


    Please try the following changed code. Assume you have set the Maximum property of the TrackBar control to 100.

    Code Snippet

                    for (var1 = 0; var1 < this.trackBar1.Maximum; var1+=10)


                        Bitmap image = FrameGrabber.GetFrameFromVideo(this.openFileDialog1.FileName, (double)var1/this.trackBar1.Maximum);

                        this.pictureBox1.Image = image;





    Best regards,

    Bruce Zhou


    Monday, November 17, 2008 10:34 AM