How to convert string to uppercase in windows textbox?

Question

I've a textbox in my windows application. It allows only alphabets and digits. I want when ever I type any alphabet, it should be converted to uppercase.How can I do that and in which event? I've used str.ToUpper() but the cursor is shifting to the beginning of the string. Please give me solution.

Solution 1

You just need to change CharacterChasing property to Upper.

textBox1.CharacterCasing = CharacterCasing.Upper

Solution 2

Why to reinvent the wheel, just set 'CharacterCasing' property of textBox to 'Upper'. You don't need to write any code.

In case of masked textbox, you can use '>' (in mask property) to make following characters uppercase. e.g. For a input alphanumeric string (A-Z, 0-9) of length eight, use mask '>AAAAAAAA'. To restrict to letters only (A-Z), use '>LLLLLLLL'.

Solution 3

You need to assign the results of ToUpper back to the textbox:

txtBox.Text = txtBox.Text.ToUpper();

Alternatively, set the CharacterCasing property of the textbox to Upper:

txtBox.CharacterCasing = CharacterCasing.Upper;

Solution 4

In properties of TextBox simply set CharacterCasing to Upper. It'll convert all entered character in uppercase.

Solution 5

private void mytextbox_KeyPress(object sender, KeyPressEventArgs e)

{

e.KeyChar = Char.ToUpper(e.KeyChar);

}

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Comments

[Sukanya]

no,doing so in keypress or keydown or keyup event shifts the cursor at the zero position in the textbox as I mentioned in my question.

[Oded]

@Sukanya - Indeed. Which is why you shouldn't do that on those event handlers. You can do this on the LostFocus event handler, but need to be careful, but a better solution is to simply set the CharacterCasing property.

[innoSPG]

The response is too long and can confuse the guy who ask. The question is actually clear and request only the event to handle.

[Jim]

It should be the best answer!