How to Prevent Multiple Instances of Child Form in MDI C#

Question

How to Prevent Multiple Instances of Child Form in MDI Windows Form Application? If there's a solution or link please send me......

Sanwar Ranwa · Answer

Hello Sourav You can check these Llinks and understand how we implement code for your Query you can check these Links https://www.c-sharpcorner.com/forums/how-to-prevent-multiple-instances-of-child-form-in-mdi-c-sharp https://www.codeproject.com/Questions/666961/How-to-stop-multiple-instances-of-mdi-form-from-op https://stackoverflow.com/questions/17378807/prevent-same-child-window-multiple-times-in-mdi-form

Amit Mohanty · Answer

Try this code. frmNewClient NC = null; private void clientToolStripMenuItem_Click(object sender, EventArgs e) { if (NC == null) { NC = new frmNewClient(); NC.MdiParent = this; NC.Show(); } else if (NC.Visible == true) { NC.WindowState = FormWindowState.Normal; NC.Show(); NC.Focus(); } else { NC = new frmNewClient(); NC.MdiParent = this; NC.Show(); } }

Laxmidhar Sahoo · Answer

try it private void button1_Click( object sender, EventArgs e) { if (System.Windows.Forms.Application.OpenForms[ "Form2" ] as Form2 == null ) { Form2 F2 = new Form2(); F2.MdiParent = this .MdiParent; F2.Show(); } else { Form2 F2 = (Form2)Application.OpenForms[ "Form2" ]; F2.Focus(); } }

How to Prevent Multiple Instances of Child Form in MDI C#

Answers (3)