What is the problem of clearing the text box?

Question

My code:

private void clearToolStripMenuItem_Click(object sender, EventArgs e)
{

RecursiveClearTextBoxes(this.Controls);

}
private void RecursiveClearTextBoxes(Control.ControlCollection cc)
{

foreach (Control ctrl in cc)
{

TextBox tb = ctrl as TextBox;

if (tb != null)

tb.Clear();

else

RecursiveClearTextBoxes(ctrl.Controls);
}
}

Vulpes · Answer

Try changing the code to this: private void clearToolStripMenuItem_Click(object sender EventArgs e) { RecursiveClearTextBoxes(this.Controls); } private void RecursiveClearTextBoxes(Control.ControlCollection cc) { foreach (Control ctrl in cc) { if (ctrl is TextBox) { TextBox tb = (TextBox)ctrl; tb.Clear(); } else if (ctrl.HasChildren) { RecursiveClearTextBoxes(ctrl.Controls); } } }

Vulpes · Answer

As pictureboxes don't support scrolling the trick is to place them in a container (such as a panel) which does. Check out this SO thread: http://stackoverflow.com/questions/4710145/how-can-i-get-scrollbars-on-picturebox

Vulpes · Answer

I couldn't actually see why your code wouldn't work though I thought it was inefficient because it was recursively calling the method for non-textbox controls which couldn't possibly have any child controls. My own effort deals with this by checking the HasChildren property is true before calling the method.

Khan Abrar Ahmed · Answer

Hi some time text box clear is having a issue instead of this you can use the Textbox.Text = string.empty; private void clearToolStripMenuItem_Click(object sender EventArgs e) { RecursiveClearTextBoxes(this.Controls); } private void RecursiveClearTextBoxes(Control.ControlCollection cc) { foreach (Control ctrl in cc) { TextBox tb = ctrl as TextBox; if (tb != null) { tb.Text= string.empty; } else { RecursiveClearTextBoxes(ctrl.Controls); } } }

Joe Wilson · Answer

Thank you very much for your answer I understood that my code was correct tooalthough I was thinking that it is not wrong.

Joe Wilson · Answer

You mean I must use panel in order to put picture box in it to use H scroll to change the Height of picture and V scroll to change the width of the picturedon't you?

Joe Wilson · Answer

Thank youBy the wayI have other question I want to use scrolls to change the size of my picture in the picture box how can I do that.Please Guide me.