Class interface property error :-field never assigned and will always contain the default value

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C#

ASP.NET

Hi,

i am getting warning error on adding new interfaces
i.e.
Field sbj_p is never assigned to ,and will always have its default value for string.

public interface interf
    {
        String Sbj { get; set; }
        
    }
    public class login : interf
    {
        private String sbj_p;
        
        
        public string Sbj
        {
            get
            {
                return sbj_p;
            }
            set
            {
                value = sbj_p;
            }
        }
}

What I have tried:

Its working for other interface.On Adding some new interfaces, it is throwing this warning. Due to this ,it is getting the default value of NULL and not taking the value that i am trying to passe it through textbox.text

Please help me out

thanks in Advance