How to delete all data from controls in opened forms using C# ???

I will separate this problem into two tasks :

I- Delete all data from one form ( main form )

II- Reaching to other open forms and delete their data .

but before starting , first create a form contain
some combo box ,text box , labels and one button

I- Delete all data from one form ( main form ) :

insert this code in the button you created ( clear button )

private void Clear_Click(object sender, EventArgs e) { Control.ControlCollection cc; cc = this.Controls; // to get all controls of your form foreach (Control ctrl in cc) { string type = ctrl.GetType().ToString(); switch (type) { case "System.Windows.Forms.ComboBox": ComboBox cb = ctrl as ComboBox; cb.SelectedIndex = -1; break; case "System.Windows.Forms.TextBox": TextBox tb = ctrl as TextBox; tb.Clear(); break; case "System.Windows.Forms.Label": Label L = ctrl as Label; L.Text = ""; break; } } }

II- Reaching other open forms and delete their data :

its the easy part , just replace one line code and add a for loop .

replace this line :

cc = this.Controls;

with this line :

cc = Application.OpenForms[i].Controls;

* Application.openforms[i] to reach to all open forms

private void Clear_Click(object sender, EventArgs e) { for (int i = 0; i <> Control.ControlCollection cc; cc = Application.OpenForms[i].Controls; //cc = this.Controls; // previous code } } }