How can a Multi-dimensional array be stored in session state and the values stored can be reterieved?

The below codings allow a multi-dimensional array to be stored in the session state

private void StoreToSession()
{
	string[,]initialArray={'A','B'};
	Session['sessionvalue']=initialArray;
}

private void ReteriveFromSession()
{
	string[,]resultantArray=(string[,])Session['sessionvalue'];
	TextBox1.Text=resultantArray[0,0].ToString();
	TextBox2.Text=resultantArray[0,1].ToString();
}