c# - validating textbox in windows form application

Question

how to validate the textbox without allowing spaces in windows form application using C#.net in my project .i can validate the text box ,without allowing spaces.... in this two things ............. 1.only spaces are not allowed 2.after entering one or two characters textbox accept spaces...........

Answer 1

You can restrict the user from entering space in the TextBox by handling the KeyPress event

void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    e.Handled = (e.KeyChar == (char)Keys.Space);
}

EDIT

In case space is allowed after entering a character or two , then you should be using

textbox1.Text.TrimStart()