C#

//My cutom type

public class CLASSIFIED
   {
       public CLASSIFIED(double Val)
       {
           this._value = Val;
       }

       private double _value;

       public static implicit operator CLASSIFIED(double Val)
       {
           return new CLASSIFIED(Val);
       }

       public static implicit operator double(CLASSIFIED CLASSIFIED)
       {
           return CLASSIFIED._value;
       }
   }

   //My Source provider
   class SourceProvider
   {
        CLASSIFIED Index {get{...} set{...}}
   }

   //My binding

   ...
   control.DataBindings.Add("EditValue", _sourceProvider, "Index");
   //This way data binding not understand what binding value have double type!!!
   ...

<br />
    public class CLASSIFIED : ISomeInterfceWhatDataBindingRecoginze<br />
    {<br />
      ....<br />
    }<br />
}<br />

public DataTable SearchField(string strSearch, string strFieldName)
        {
            DataTable dt = new DataTable();
            
            foreach (DataRow dr in data.Rows)
            {
                string strT = dr[strFieldName].ToString();
                if (stringSearchMP(strSearch, strT) != -1)
                {
                    DataRow row = dr;
                    dt.ImportRow(row);
                }
            }
            return dt;
        }