Change DataType of column in SQL Server

Well Efforts. But my requirment is another, and solved by self.

Thanks to efforst. Note - I was change my data table's data type of a specific column.

It could be happen if we are set column value as NULL than we are changed tha column data type very easy as - 

Step 1 -

alter table table_name
alter column column_name datatype null;

Step 2 - 

alter table table_name
alter column column_name datatype;