C＃中的空文本框验证 [英] Empty Textbox Validation in C#

问题描述

我是c＃全新的。所以我只是进入了基础知识。现在我开始使用Windows窗体。现在我必须添加2个文本框和1个插入按钮现在，当我进入文本框时，它应该在单击按钮时插入。现在我需要的是当文本框为空时，当我点击按钮时，它应该显示错误。我认为这是非常小的问题。但是因为我是新手，所以我会指导我这样做。



问候

Balamurugan

Hi,
I am completely new to c# .so i am just into basics.Just now i am beginning to work with windows forms.Now i have to add a 2 text boxes and 1 insert button now when i'm entering the textboxes it should be inserted when the button is clicked.Now what i need is that when the text boxes is empty and when i clicked the button , it should show a error.I Think this is very small problem. But as i'm new, pl guide me to do it .

Regards
Balamurugan

推荐答案

假设你的文本框名称ID是 txtBox 。然后在你的提交按钮代码中尝试这个：

Lets say you textbox name ID is txtBox. then try this in your submit button code:

if(txtBox.Text.Trim() == string.Empty)
{
 Messagebox.Show("Please enter something in the textbox");
 return; // return because we don't want to run normal code of buton click
}

// your normal button code will some here

试试这个，

try this out,

if (TextBox1.Text == "")
                    MessageBox.Show("Enter Some Text in TextBox1");

对于空文本框验证我们需要遵循以下代码：

For Empty textbox validation we need to follow the below code:

if (textBox1.Text == "")
{
   string myStringVariable1 = string.Empty;
   MessageBox.Show("User Name is requierd");
}
else if (textBox2.Text == "")
{
   string myStringVariable2 = string.Empty;
   MessageBox.Show("Password is requierd");
}
//For combobox validation we should follow the below code.
else if (comboBox1.Text == "--Choose--")
{
   string myStringVariable3 = string.Empty;
   MessageBox.Show("Select User Type");
}

这篇关于C＃中的空文本框验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！