How to Clear the Text of All Textboxes in the Form

Clear all textboxes at once in winform

this method clear all textbox from WinForm

void ClearTextboxes(System.Windows.Forms.Control.ControlCollection ctrls)
    {
       foreach (Control ctrl in ctrls)
       {
          if (ctrl is TextBox)
              ((TextBox)ctrl).Text = string.Empty;
          ClearTextboxes(ctrl.Controls);
       }
    }

and you can call it

private void btnReset_Click(object sender, EventArgs e)
{
    ClearTextboxes();
    txtFname.Focus();
}

How to clear all textboxes in a Web Form? (The name 'form1' does not exist in the current context)

The textboxes were inside a content placeholder. The code below worked.

        void cleanFields()
    {
        foreach (Control item in Page.Form.FindControl("ContentPlaceHolder1").Controls)
        {
            if (item is TextBox)
            {
                ((TextBox)item).Text = string.Empty;
            }
        }

    }

Clear all textbox in a windows form except special ones

Shorter version of GetAllChildren:

protected static IEnumerable<Control> GetAllChildren(Control root) {
  return new Control[] { root }
    .Concat(root.Controls
      .OfType<Control>()
      .SelectMany(item => GetAllChildren(item)));
}

And shorter Linq:

var source = GetAllChildren(root)
  .OfType<TextBox>()
  .Where(ctrl => !except.Contains(ctrl));

foreach (var textBox in source)
  textBox.Text = resetWith;

The problem with your current implmentation is in the inner loop:

foreach (TextBox txtException in except)
  if (txtException.Name != txt.Name)
    txt.Text = resetWith == "" ? string.Empty : resetWith;

if you have at least two exceptions with different names that condition

 txtException.Name != txt.Name

will be inevitably satisfied (any txt.Name either not equal 1st exception or 2nd one)

Clear multiple text boxes with a button in C#

void ClearAllText(Control con)
{
    foreach (Control c in con.Controls)
    {
      if (c is TextBox)
         ((TextBox)c).Clear();
      else
         ClearAllText(c);
    }
}

To use the above code, simply do this:

ClearAllText(this);

Any way to clear all fields in a form at once?

You can use the following loop to clear all the textbox objects in your active form:

foreach (Control c in this.Controls) 
{
    if (c.GetType() == typeof(TextBox))
    {
        c.Clear();
    }
}

You can also use the loop inside a function and give it a Boolean return value to test if it was successfuly executed.

Clear all TextBoxes texts

Try this code:

void ClearTextBoxes(Control parent)
{
    foreach (Control child in parent.Controls)
    {
        TextBox textBox = child as TextBox;
        if (textBox == null)
            ClearTextBoxes(child);
        else
            textBox.Text = string.Empty;
    }
}

private void ClearButton_Click(object sender, EventArgs e)
{
    ClearTextBoxes(tabControl1.SelectedTab);
}