How to change the colour of textbox in case of wrong username and password

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I want to change the colour of textbox when user gives in correct password and username ..please tell me how would i do this

ASP.NET

<form id="form1" runat="server">
           <h2>
               Login
           </h2>
           <p>
               <input id="userName" type="text" placeholder="Username" runat="server" /></p>
           <p id="readonlyUserName" class="hide">
               <img src="images/administrator.png" class="center" width="55px" height="55px" alt="account picture" /></p>
           <p>
               <input id="password" type="password" placeholder="Password" runat="server" /></p>
           <label for="remember">
               <input type="checkbox" id="remember" value="remember" runat="server" />
               <span>Remember me on this computer</span>
           </label>
           <asp:Button ID="LoginButton" CssClass="button loginButton" runat="server" Enabled="true"
               OnClick="LoginButton_Click" />

Posted 7-Nov-13 19:21pm

ajays3356

Updated 7-Nov-13 19:49pm

CodeBlack

v2

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CodeBlack 8-Nov-13 1:31am

can you show me the code for LoginButton_Click

Thomas ktg 8-Nov-13 1:35am

use this code to change the textbox color whe the username and password are incorrect.
TextBox1.BackColor = System.Drawing.Color.LavenderBlush;

CodeBlack 8-Nov-13 1:47am

instead of replying. create a new comment so that it can notify the person who asked the question. use reply button when required.

lukeer 8-Nov-13 1:37am

1) Don't repost for providing further information. Use the "Improve question" link instead.
2) Enclose code in "pre" tags. They look like this: <pre lang="XML">YourCodeHere();</pre>

I did this in your original question and will vote this as repost.

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Vishal Pand3y · Answer 1 · 2013-11-07T19:40:00

You can use css if any for checking validation

CSS

.newtext
{
    border: 1px solid #55aad1;
    background: #fff;
    color: #333;
    font-size: 1.2em;
    margin: 5px 0 6px 0;
    padding: 5px;
    width: 300px;
}
.newtext:focus
{
    border: 1px solid #55aad1;
}
.newtext-validation-error
{
    border: 1px solid #e80c4d;
    background-color: #fc7e7e;
}

and for textbox color change in case of wromg user name or pass use this

C#

textBox.TextChanged += (sender, args) => {
    int ignored;
    bool valid = int.tryParse(textBox.Text, out ignored);
    textBox.ForeColor = valid ? Color.Black : Color.Red;
};

Thanks7872 · Answer 2 · 2013-11-07T19:41:00

Create two CssClass,one for normal textbox and one for designing it after invalid attempt for login.

Change it as per your requirement in code:

C#

if(!IsPostBack)
   TextBox1.CssClass = "txtnormal";//set normal style on first load

C#

protected void btnLogin_Click(object sender, EventArgs e)
{
    //code to validate the user
    TextBox1.CssClass = "txtinvalid";//change CssClass on invalid attempt
}

Regards...

sankarsan parida · Answer 3 · 2013-11-07T19:43:00

See I have changed your user name input textbox to asp:TextBox

<asp:TextBox ID="userName" type="text" placeholder="Username" runat="server" AutoPostBack="True" OnTextChanged="userName_TextChanged" />

Added on Textchanged event where you will check this user name to your database username if this is not exist then throw error message with textbox color change

C#

protected void userName_TextChanged(object sender, EventArgs e)
   {
       //In this case I have just taken a demo name, But you will check your textbox value to database
       //If it will not exist then throw the error message
       if (userName.Text != "sankar")
       {
           userName.BackColor = System.Drawing.Color.Red;
           Response.Write("Wrong Username");
       }
       else {
           userName.BackColor = System.Drawing.Color.White;
       }
   }

How to change the colour of textbox in case of wrong username and password

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