count the characters in textbox

you can use 'length' property of textbox.text..simple....
thankyou

In web ,

Please add below attributes for the textbox event ,

1. onkeypress
2. onkeyup
3. onkeydown
4. onPaste

[ Javascript ]

 function CheckLength(txt,maxLen)
 {
       try
       {
           if(txt!= null)
           {            
               var iLength = txt.value.length
               if (iLength <= maxLen) //Check the Limit.
               {
                   //Display the remaining characters
                   document.getElementById('').innerHTML = maxLen - iLength + " are remaining characters.";
                }
                else
                {
                    txt.value = txt.value.substring(0, maxLen);
                    return false;
                }              
     }   
    }
    catch(e)
    {
        return false;  
    }
}
 

Please mark as answer if its help out.

Hi,
Should be used JavaScript. Here small sample. But need to handle additional things, if needed ie. any special character handlings.
aspx
 
       
JavaScript
function HandleKeyUp(ctlr)
{
    var label = $get("statusLabel");
    var length = ctlr.value.length
    label.innerText = "You reached " + length  + " characters";
   
}
CodeBehind
            if (!IsPostBack)
            {
                TextBox1.Attributes.Add("onkeyup", "HandleKeyUp(this);");
}

hi ajay,
 
private void textBox1_TextChanged(object sender, EventArgs e)
{
label1.Text = Convert.ToInt32((textBox1.MaxLength) - (textBox1.Text.Length)).ToString();
}
 
If answer is helpful plz mark it as accepted answer......Thank u

hi ajay,
 
private void textBox1_TextChanged(object sender, EventArgs e)
{
label1.Text = Convert.ToInt32((textBox1.MaxLength) - (textBox1.Text.Length)).ToString();
}
 
If answer is helpful plz mark it as accepted answer......Thank u

hi ajay,
 
private void textBox1_TextChanged(object sender, EventArgs e)
{
label1.Text = Convert.ToInt32((textBox1.MaxLength) - (textBox1.Text.Length)).ToString();
}
 
If answer is helpful plz mark it as accepted answer......Thank u

hi! Mathews,
mainly i used web. (also give a code for windows)

hi! krishna prasad,
It is not working.