title: SSRS null parameter to return values
body: <p>I have two reports bound to each other. On the first report when I choose a field I am lead to a second report showing only data from the row I selected in the first report. The second report is used for updating, therefore it takes in parameters. I have three text-boxes which allow a null value and a dropdown list.</p>
  
  <p>First when I created the dropdown list and specified the values, and added a null value the report returned the row I selected in the first report with all the data. Now I tried to assign the values of the parameter to a database, but each time I get to this report it first asks to select a value from the dropdown and then it will display the data.</p>
  
  <p>How can I add a Null value to the items retrieved from the DB so when null is selected as default then all values would be returned without any problems, and without any selection needed?</p>