Null object cannot be converted to a value type

for fixing this error u have to do typecasting like

 

for null value: if x value is null  then u can use x? this will convert this value is nullable so u can easily convert the value type. just use ? this keyword before datatype.

 

like this

 

var x? = null;

then Convert.ToInt32(x); then value will come null but it don't given null Exception.