Unfortunately, as a 50% owner, you don't really have much in the way of options unless you had a written buy-out agreement whose terms you can enforce. Otherwise:1) Without a buy-out agreement, you cannot compel a buyout or require a specific price (or even a require or mandate some particular methodology for calculating value)--when there is no contract to buy-out, it is voluntary on the part of the owners to work out a buyout.2) As a 50% owner, you are not a majority owner; not a being a majority owner, you cannot unilaterlaly dissolve the corporation. (It requires the agreement of a majority, or 50.1% or more, of the ownership to do that.)You and your partner have to work this out between the two of you.