How To Decrease Value in Label When enter data in textbox

 Decrease value of label when we enter a data in textbox

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class HelpDesk : System.Web.UI.Page
{
    private const int Max_Length =10;

    protected void Page_Load(object sender, EventArgs e)
    {
       // Label5.Text = Convert.ToString(Convert.ToInt16(TextBox2.Text.Length) - 1);
        Label5.Text = string.Format("{0} Characters Remains",Max_Length);
        TextBox2.MaxLength = Max_Length;

    }
    protected void TextBox2_TextChanged(object sender, EventArgs e)
    {
        Label5.Text = string.Format("{0} Characters Remains",Max_Length-TextBox2.Text.Length);
        //if (TextBox2.Text == "")
        //{
        //    Label5.Text = "10 Characters Remains ";

        //}
        //if (TextBox2.Text.Length<10)
        //{
        //    Response.Write("Character Length Exists");
        

        //}
        //string backspace = TextBox2.Text.Trim();
        //if (backspace.Length > 1)
        //{
        //    TextBox2.Text = backspace.Substring(0, backspace.Length - 1);


        //}
        //else
        //{
        //    Label5.Text = "10 Charaters";

        //}

       
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

    }
}

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Conclusion

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