C Sharp Clear Method

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what is the difference between these two lines :

C#

comboBox3.Text = "";
textBox5.Clear();

Posted 28-Jun-13 22:45pm

Sumon562

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4 solutions

Solution 4

The 'Clear method of a TextBox simply removes all text content from the TextBox; it is exactly equivalent to someTextBox.Text = ""; ... or ... someTextBox.Text = null;

Manipulating the 'Text field of a ComboBox is a very different process because it interacts with the current 'SelectedIndex property of the ComboBox:

1. comboBox3.Text = ""; ... or comboBox3.Text = null; ... will set the current SelectedIndex to -1. What you will see displayed in the ComboBox text-area at run-time is: nothing.

2. comboBox3.Text = "Choice ABC"; will possibly have two effects:

a. if "Choice ABC" is an existing item in the ComboBox item collection, then the current SelectedIndex will be set to match the index of "Choice ABC." And, "Choice ABC" will be displayed in the ComboBox text-area.

b. if "Choice ABC" is not an existing item in the ComboBox item collection, then the current SelectedIndex will not be changed, but "Choice ABC" will be displayed in the ComboBox text-area.

Posted 30-Jun-13 11:51am

BillWoodruff

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Thomas Daniels · Accepted Answer · 2013-06-28T23:02:00

Solution 2

Hi,

When I decompiled the TextBoxBase.Clear method, I got this:

C#

/// <summary>
/// Clears all text from the text box control.
/// </summary>
public void Clear()
{
  this.Text = (string) null;
}

So, the Clear method sets the Text property to null.

Posted 28-Jun-13 23:02pm

Thomas Daniels

Updated 28-Jun-13 23:04pm

v2

Prasad Khandekar · Accepted Answer · 2013-06-28T22:59:00

Solution 1

Hello Mohi,

Both methods are similar in their action, they clear the contents of a textbox, You can use TextBox.Clear method to clear the contents of the control instead of assigning the Text property an empty string.

Regards,

Posted 28-Jun-13 22:59pm

Prasad Khandekar

Comments

Sumon562 29-Jun-13 5:01am

Thank You. I am posting another question. Please help

HiiMa MhMd · Accepted Answer · 2013-06-28T23:05:00

Solution 3

I think no difference but
1. Clear is method provided
2. text=""; is old tradition way to clear the text
i recommend to use clear

Posted 28-Jun-13 23:05pm

HiiMa MhMd