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

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

Sourav Kumar Das

Sourav Kumar Das

8y1.2kVisual Basic .NET

How to Prevent Multiple Instances of Child Form in MDI Windows Form Application?

If there's a solution or link please send me......

3 Replies

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Sanwar Ranwa8y ago
Accepted 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
+2
Amit Mohanty7y ago
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();
}
}

+2
Laxmidhar Sahoo8y ago
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();
        }
    }
+3