C# clear all textboxes and uncheck all checkboxes in WPF

Question

I am trying to figure out how to clear all textboxes and uncheck all checkboxes in a C# WPF. The form has a lot of textboxes and it will get tedious to do .Clear() or = "" for every single textbox. Same thing with checkboxes.

I heard it is easy in Windows Forms doing something like below using a foreach loop, but I am doing this on a WPF so I cant get that to work.

foreach (Control c in Controls)
{
  if (c is CheckBox)
  {
     ((CheckBox) c).Checked = false;
  }
  else if (c is TextBox)
  {
    ((TextBox) c).Text = "";
  }
}

Anyone have any advice? Thanks

Answer 1

Let the whole controls are inside a Container( let it be a Stack panel) like the following:

<StackPanel Name="containerCanvas" Margin="0,0,0,191">
    <CheckBox Name="chk1" >chk1</CheckBox>
    <CheckBox Name="chk2" >chk2</CheckBox>
    <CheckBox Name="chk3" >chk3</CheckBox>
    <TextBox Name="txt1" Text="xxxxxxxx"></TextBox>
    <TextBox Name="txt2" Text="xxxxxxxxx"></TextBox>
    <TextBox Name="txt3" Text="xxxxxxxxxx"></TextBox>
</StackPanel>

And then the Click event for the Clear button will be like the following:

private void btnClear_Click(object sender, RoutedEventArgs e)
{
    foreach (Control  ctl  in containerCanvas.Children)
    {
        if (ctl.GetType() == typeof(CheckBox))
            ((CheckBox)ctl).IsChecked = false;
          if (ctl.GetType() == typeof(TextBox))
            ((TextBox)ctl).Text = String.Empty;
    }
}

Answer 2

To achieve this you can place the controls inside a container (in this case a StackPanel).
This way you can easily access the Group of Controls you need.

Note(s):

• In the pseudo code representation bellow; I'm separating the functionality in order to simplify understanding so it can be easily adapted to suit your needs.

Example Controls

This example uses 2 Buttons:

• A Reset Button: To Reset TextBoxes Text
• A Toggle Button: To Toggle CheckBoxes Checked State.

The CheckBoxes and Textboxes are each declared inside a StackPanel.
This allows accessing a group of Controls that are inside a Container and therefore to perform the action(s) required.

• A StackPanel containing CheckBoxes (Bellow Renamed to: "sp_CheckBoxes").
• A StackPanel containing TextBoxes (Bellow Renamed to: "sp_TextBoxes").

Example Events

• Both Buttons have the Same Event assigned ("Button_Click").
• The Event itself will check wich Button was Pressed and Act Accordingly.

XAML

<!-- Buttons -->
    <Button x:Name="btn_ResetText" Click="Button_Click" Content = "Reset" />
    <Button x:Name="btn_TogglecheckBoxes" Click="Button_Click" Content = "Toggle" />

<!-- Stack Panel Containing CheckBoxes -->
    <StackPanel x:Name="sp_CheckBoxes">
        <CheckBox x:Name="myCheckBox1" Content="ContentText1"/>
        <CheckBox x:Name="myCheckBox2" Content="ContentText2"/>
        <CheckBox x:Name="myCheckBox3" Content="ContentText3"/>
        <CheckBox x:Name="myCheckBox4" Content="ContentText4"/>
        <CheckBox x:Name="myCheckBox5" Content="ContentText5"/>
    </StackPanel>

<!-- Stack Panel Containing TextBoxes -->
    <StackPanel x:Name="sp_TextBoxes">
        <TextBox x:Name="myTextBox1" Text="Text1"/>
        <TextBox x:Name="myTextBox2" Text="Text2"/>
        <TextBox x:Name="myTextBox3" Text="Text3"/>
        <TextBox x:Name="myTextBox4" Text="Text4"/>
        <TextBox x:Name="myTextBox5" Text="Text5"/>
    </StackPanel>

C#

// The Button Click Event Assigned for Both Buttons
private void Button_Click(object sender, RoutedEventArgs e)
{
    // When one of the Button is Pressed:
    // Filter wich Button was Pressed
    Button btn = (Button)sender;

    // Act Accordingly
    switch (btn.Name)
    {
        case "btn_ToggleCheckBoxes": ToggleCheckBoxes(); break;
        case "btn_ResetText": ResetText(); break;
    }
}

// The Method to Toggle CheckBoxes
private void ToggleTextBoxes()
{
    foreach (CheckBox chkb in sp_CheckBoxes.Children)
    {
        if ((bool)chkb.IsChecked) { chkb.IsChecked = false; }
        else { chkb.IsChecked = true; }
    }
}

// The Method to Clear TextBoxes
private void ResetText()
{
    foreach (TextBox txt in sp_TextBoxes.Children)
    {
        txt.Clear();
    }
}

Answer 3

Hi below is code used in my real time project.

The below code will help you to identify all the child controls from the Parent control and do the action as we wish. Here i have used panel as a parent control and cleared all the text box control value with one shot by using simple method.

Sample code

public void SetTextBoxToNull(Panel pnlobjid)  
{  
    try  
    {  
        foreach(Control cntrl in pnlobjid.Controls)  
        {  
            if (cntrl is TextBox)  
            {  
                TextBox txtbox = cntrl as TextBox;  
                txtbox.Text = "";  
            }  
        }  
    }  
    catch (Exception ex)  
    {  
        string test = ex.Message;  
    }  
} 

Hope the above code will give some guidance for you,Please let me know thoughts.

Thanks

Answer 4

I've looked answers on the same question :) Thanks for solutions. Now in my program working similar code:

void clearTextBox(Grid gridName)
{
    foreach (Control txtBox in gridName.Children)
    {
        if (txtBox.GetType() == typeof(TextBox))
            ((TextBox)txtBox).Text = string.Empty;
        if (txtBox.GetType() == typeof(PasswordBox))
           ((PasswordBox)txtBox).Password = string.Empty;
    }
}