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Form.Show() is not showing it's child controls


Form.Show() is not showing it's child controls

By : Jess Cheda
Date : October 28 2020, 08:00 PM
I hope this helps you . Your form doesn't work for the same reason shellForm doesn't work. The UI thread is busy loading and painting the controls, it can't paint your PleaseWait form at the same time. You'll need to create a separate thread that pumps a message loop to keep your PW form alive. You could make it work like this:
code :


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How to use a method from the Startup form to enable its controls when called through a child form?

How to use a method from the Startup form to enable its controls when called through a child form?


By : crylico
Date : March 29 2020, 07:55 AM
this one helps. Use ShowDialog() to show your login form. This will stop the execution of code in the startup form until the login form closes
code :
private void adminToolStripMenuItem_Click(object sender, EventArgs e)
{
    // Putting the creation of the form inside a using block allows
    // the automatic closing and disposing of the form when the code
    // reaches the closing brace of the using block.
    using(FrmAdminPassword frmAdminPassword = new FrmAdminPassword())
    {
        // This opens the frmAdminPassword form in modal mode, no 
        // code is executed after the call until you close the 
        // form with DialogResult.OK, DialogResult.Cancel or whatever 
        if(DialogResult.OK == frmAdminPassword.ShowDialog())
        {
            MessageBox.Show("Login executed with success!");
        }
        else
        {
            // Mo password given or form cancelled
            // put here the logic to exit or disable things
        }
    }
}
public partial class FrmAdminPassword : Form
{
    private void btnLoginAdmin_Click(object sender, EventArgs e)
    {
        if (mskAdminPassword.Text == "password")
            this.DialogResult = DialogResult.OK;
        else
        {
            MessageBox.Show("Not a valid password");
            this.DialogResult = DialogResult.None;
        }
    }
}
Controls from abstract base-Form not shown when inherited by a child Form

Controls from abstract base-Form not shown when inherited by a child Form


By : Pi53
Date : March 29 2020, 07:55 AM
around this issue I am following the solution provided by Juan Carlos Diaz here , Add a call to the base constructor
code :
public partial class ConcreteForm : AbstractBaseForm
{
    public ConcreteForm() : base()
    {
         InitializeComponent();
    }
}
how to show a child form in MDI container without the apperance of the controls in the Container Form in the Child Form?

how to show a child form in MDI container without the apperance of the controls in the Container Form in the Child Form?


By : Dennis Mushonga
Date : March 29 2020, 07:55 AM
Hope this helps sir i have best solution for
create new empty form and than set following property of this form
Why isn't the Validated event firing for controls on a form created in the main form when the child form is closed?

Why isn't the Validated event firing for controls on a form created in the main form when the child form is closed?


By : Franz Scholz
Date : March 29 2020, 07:55 AM
Hope that helps This is caused by ShowDialog(). It is a documented bug, a mistake in .NET 1.x that they could not fix anymore. From the Form.cs source code:
code :
   // NOTE: We should also check !Validate(true) below too in the modal case,
   // but we cannot, because we didn't to this in Everett (bug), and doing so
   // now would introduce a breaking change. User can always validate in the
   // FormClosing event if they really need to. :-(
    protected override void OnFormClosing(FormClosingEventArgs e) {
        if (e.CloseReason == CloseReason.UserClosing && this.DialogResult != DialogResult.Cancel) {
            if (!base.Validate(true)) e.Cancel = true;
        }
        base.OnFormClosing(e);
    }
Access controls located on the main form when the child form closes

Access controls located on the main form when the child form closes


By : twinklisha
Date : September 22 2020, 10:00 PM
I wish this helpful for you I have created a main form which is always visible to users... its got some menu options. This form (Main) has got a number of hidden buttons which I am trying to unhide from another child form once the child form closes. My question is..."how do you transfer control from child to Main or reference the buttons on the Main form once the child have close. in advance for all help and suggestions. Here is what I have got so far:- , Subscribe to the child form's FormClosed event:
code :
var childForm = new ChildForm();
childForm.FormClosed += ChildFormClosedHandler;
childForm.Show();
private void ChildFormClosedHandler(object sender, FormClosedEventArgs e)
{
    foreach (Button button in this.Controls.OfType<Button>()){
        button.Visible = true;
    } 
}
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