How To Close All Child Form and Open Only Child Form At A time

Question

Create MDI Application In C# dot net Conatin(2 Child Form) open one child form and again open this same child form then same form open 2 times.
Please Give me anser to open one child form at atime in c#
Thanks Regards
Shailaja

jinge · Answer

Suppose we have a menustrip in the Form with 3 menu items. The first two will open a child form by click. The last menu item will close all the child forms. Here is the code: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace Test1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); this.IsMdiContainer = true; } //open child 1 private void openChild1ToolStripMenuItem_Click(object sender, EventArgs e) { Form f = new Form(); f.MdiParent = this; f.Show(); } //open child 2 private void openChild2ToolStripMenuItem_Click(object sender, EventArgs e) { Form f = new Form(); f.MdiParent = this; f.Show(); } //close all private void closeAllToolStripMenuItem_Click(object sender, EventArgs e) { foreach (Form f in this.MdiChildren) { if (f != null) { f.Dispose(); } } } } } Let me know if it helps. jinge

jinge · Answer

If you mean only one form can be open at a time, you can check if there's already one child open, if not, then instantiate a new child and show it. See changed version: public Form1() { InitializeComponent(); this.IsMdiContainer = true; } //open child 1 private void openChild1ToolStripMenuItem_Click(object sender, EventArgs e) { if (this.MdiChildren.Length == 0) { Form f = new Form(); f.MdiParent = this; f.Show(); } } //open child 2 private void openChild2ToolStripMenuItem_Click(object sender, EventArgs e) { if (this.MdiChildren.Length == 0) { Form f = new Form(); f.MdiParent = this; f.Show(); } } //close all private void closeAllToolStripMenuItem_Click(object sender, EventArgs e) { foreach (Form f in this.MdiChildren) { if (f != null) { f.Dispose(); } } }

Shailaja Mohite · Answer

Thanks Jinge I Implement Your Solution But First Child Form Is Open Multiple Times. Please Tell Me How To Open One Child Form At A Time

Shailaja Mohite · Answer

Thanks But First Child form opened Multiple times Please tell me How to open first child form at a time

How To Close All Child Form and Open Only Child Form At A time

Answers (4)