Object cannot be cast from DBNull to other types for Double Data Type

Question

I am seeing error when there is null value in database for any cell, Object cannot be cast from DBNull to other types. - Asp.net grid view

Answer 1

You need to compare you values with DBNull.Value as follow

protected string PercentageChange(object client_Price, object second_price)
{
       if(client_price==DBNull.Value)
       {
           .....
       }
       //double price1 = Convert.ToDouble(client_Price);
       //double price2 = Convert.ToDouble(second_price);
       //double percentagechange = ((price1 - price2) / price2) * 100;
       //return percentagechange ;
 }