How to change the color of a button on btnclick event

For Window Form application :
 

private void button3_Click(object sender, EventArgs e)
        {
            button3.BackColor = System.Drawing.Color.Black;
        }

 

For Web Page :
 
On Page level declare static variable:

static bool Isdefault= true;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                Isdefault = false;
            }
        }

 
and in button click event write :

protected void Button1_Click(object sender, EventArgs e)
       {
           if (!Isdefault)
           {
               Button1.BackColor = System.Drawing.Color.GreenYellow;
           }
       }

Just check out the following, maybe it will help you:
 

public void single_button_Click(object sender, EventArgs e)
  {
    Button btn = (Button)sender;
    if (btn.BackColor == Color.Red)
    {
      btn.BackColor = SystemColors.Control;
    }
    else if (btn.BackColor == SystemColors.Control)
    {
      btn.BackColor = Color.Red;
    }
  }

Hi,
 
You can do it in various ways. Check some of the links here.
 
Change Background Color of ASP.NET Button using jQuery
Changing color of jQuery UI Buttons
C# Change A Button's Background Color
 
These links will guide you.
Thanks

If its a windows based application then,
 
change the property of your button's flat style to "Standard" ane on click write the below:
button1.BackColor = Color.Red;
 
it will work fine.

What exactly you mean it did not work,
 
If this is windows application written in C#,
 

button1.BackColor = Color.Green;

 
Just check, which event you are wiring up. Post some more code for us to see.

hi friend..
 
on btn click event.....

Btn1.BackColor = System.Drawing.Color.Red;