Validation text box

屈人钱

How to verify whether the text box is empty in winforms
Can you provide the code?

苹果小刀

if (text1.Text! = null&&text.Text.Trim (). Length> 0)
{
}

kalian2000

Does the landlord want to ask if there are authentication controls like in WebForm?

Not in WinForm ..

Isn't it enough to write a judgment sentence?

if (this.TextBox1.Text.Trim ()! = "")
{
    // The description is not empty, operate ...
}

ms5guigui

example
Suppose there is a textbox1
 if ((textbox1.text! = null)&&textbox1.text.length ()> 0&&(textbox1.text! = ""))
{
}
 Another way is to write a regular expression based on what you want to enter the text box, as long as the input of the text box does not meet the specifications, an error will be reported
 The error reporting controls are errorprovider
Can pass erroprovider.seterror ("error prompt content")
  Set error notification.