How to change color of textbox in C# GUI?

Hi Nits,

Iam attaching the source code ,please look into it.

Thanks

Hi Nits,

If this post helps you mark it as answer

Thanks

Hi Nits,
Here is your desired code.


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;


namespace change_color_of_textbox
{
  public partial class Form1 : Form
  {
  public Form1()
  {
  InitializeComponent();
  }

  private void textBox1_Leave(object sender, EventArgs e)
  {

  if (textBox1.Text == "")
  {

  textBox1.BackColor = Color.Red;
  }
  else
  {
  textBox1.BackColor = Color.White;
  }
  }

  private void textBox1_KeyDown(object sender, KeyEventArgs e)
  {
  if (e.KeyCode == Keys.Space)
  {
  e.SuppressKeyPress = true;

  }
  }

  private void textBox2_Leave(object sender, EventArgs e)
  {
  if (textBox2.Text == "")
  {

  textBox2.BackColor = Color.Red;
  }
  else
  {
  textBox2.BackColor = Color.White;
  }
  }

  private void textBox2_KeyDown(object sender, KeyEventArgs e)
  {
  if (e.KeyCode == Keys.Space)
  {
  e.SuppressKeyPress = true;

  }
  }

  private void textBox3_Leave(object sender, EventArgs e)
  {
  if (textBox3.Text == "")
  {

  textBox3.BackColor = Color.Red;
  }
  else
  {
  textBox3.BackColor = Color.White;
  }
  }

  private void textBox3_KeyDown(object sender, KeyEventArgs e)
  {
  if (e.KeyCode == Keys.Space)
  {
  e.SuppressKeyPress = true;

  }
  } 
  }
}




Thanks
If this post helps you mark it as answer

It sounds like you're putting the code in the wrong place - possibly in the TextChanged eventhandler.

If you put it, say, in the Leave eventhandler, then it should work:

Hi,

Try this,

 string a = textBox1.Text;
            if (a != String.Empty)
            {
                textBox1.BackColor = Color.Red;
            }
            else if (a == String.Empty)
            {
                textBox1.BackColor = Color.White;
            }
            else
            {
                textBox1.BackColor = Color.Black;

            }

Hope this will help you.

Thanks.