Looks like I have solved the issue. Here is the code. private void TV_AfterSelect(object sender, TreeViewEventArgs e) { btnPrev.Enabled = false; btnNext.Enabled = false; TreeNode newSelected = e.Node; DirectoryInfo nodeDirInfo = (DirectoryInfo)newSelected.Tag; int numFile = 0; this.groupBox2.Controls.Clear(); sldNum = nodeDirInfo.GetFiles("*.sld").Count(); ShowSld(); foreach (FileInfo file in nodeDirInfo.GetFiles("*.sld")) { numFile++; sldArray[numFile].FileName = file.FullName; } } private void ShowSld() { int xPos = 10;// 140; int yPos = 23;// 140; AddControls("sld", sldNum); //Create slides. int n = 1; while (n < sldNum + 1) { sldArray[n].Tag = n; sldArray[n].Width = 125; sldArray[n].Height = 115; if (xPos > 570) { xPos = 10; yPos = yPos + sldArray[n].Height + 28; } sldArray[n].Left = xPos; sldArray[n].Top = yPos; xPos = xPos + sldArray[n].Width + 15; groupBox2.Controls.Add(sldArray[n]); n++; } } private void AddControls(string anyControl, int cNumber) { switch (anyControl) { case "sld": sldArray = new AxSLIDELib.AxSlide[cNumber + 1]; for (int i = 0; i < cNumber + 1; i++) { sldArray[i] = new AxSLIDELib.AxSlide(); } break; } } But my next problem is, if there are more than 15 files in the folder, how do I display it in the form using the Previous and Next button? Thanks
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