Question

The below code and the config works fine, but force to enter user name/password case sensitively, i want to make it non case sensitive.

Code:

protected void LoginButton_Click(object sender, EventArgs e)
        {
            try
            {
                string uid = UserText.Text.Trim();
                string pwd= PwdText.Text.Trim();

                if (string.IsNullOrEmpty(uid) ||
                    string.IsNullOrEmpty(pwd))
                {
                    throw new ApplicationException("UserName or Password should not be blank.");
                }

                bool isAuthrnticated = FormsAuthentication.Authenticate(uid, pwd);

                if (isAuthrnticated)
                {
                    FormsAuthentication.SetAuthCookie("Admin", false);

                    //...
                }
                else
                {
                    ((Site)this.Master).ShowError("Invalid UserName/Password.", ErrorSeverity.Warning);
                }
            }
            catch (Exception ex)
            {
                ErrorLogger.LogError(ex);
                ((Site)this.Master).ShowError(ex.Message, ErrorSeverity.Warning);
            }
        }

Web.Config

<authentication mode="Forms">
  <forms defaultUrl="~/Default.aspx" loginUrl="~/Default.aspx" slidingExpiration="true" timeout="1000">
    <credentials passwordFormat="Clear">
      <user name="Admin" password="ZAdmin"/>
    </credentials>
  </forms>
</authentication>

Answer 1

By default, usernames are not case sensetive and passwords are. The easiest way to do this is when they register, change both un and pw to either ToUpper() or ToLower() and then when you are authenticating, do the same to whatever they enter.

string uid = UserText.Text.Trim().ToUpper();
string pwd= PwdText.Text.Trim().ToUpper();