yesterday i asked a question related by creating new class and inheritance.
some friends answer . but in an exercise i have a problem. in Datagridview there is a property named Columns . it can used in 3 way .
3-with column name
i want to add a new propery named Equation under columns(index) . so after that i must could do this...
for example i want in column by index=1 do this :
what is the steps of this?