Transfer SelectOption Values to Dynamin Query

Question

Trying to get the values to my Controller that I can change the limit on the displayed List on my Page. I'm Using a dynamic query and everything is working fine but what's below. What am I'm missing?

If instead of selectOption, I use CommandLink that calls the same Action it works, but don't want that. I want selectOption to work!

<apex:selectList value="{! PageSize }" size="1" id="resultLimit">
   <apex:selectOption itemValue="5" itemLabel="5">
      <apex:param value="5" name="5" assignTo="{!rowLimit}"/>
   </apex:selectOption>
   <apex:selectOption itemValue="5" itemLabel="5">
      <apex:param value="5" name="5" assignTo="{!rowLimit}"/>
   </apex:selectOption>
   <apex:selectOption itemValue="10" itemLabel="10">
      <apex:param value="10" name="10" assignTo="{!rowLimit}" />
   </apex:selectOption>
   <apex:selectOption itemValue="20" itemLabel="20">
      <apex:param value="20" name="20" assignTo="{!rowLimit}" />
   </apex:selectOption>
<apex:actionSupport event="onchange" reRender="results" action="{!resetList}"  status="myStatus"/>
</apex:selectList> 

On Controller :

public String rowLimit = '5';
public String getRowLimit()   {
     if (rowLimit == null || rowLimit == '') {
          return '5'; 
     }
    else {
     return rowLimit;
    }
 }
public void setRowLimit(String limitExp)
   {  
     rowLimit = limitExp;
   }

public void resetList () {
 /* This Method Run the Dynamic Query and reset the List Table on Page */
}

Answer 1

Since PageSize will already hold the selected value, I don't think there is a need to use apex:param. You can directly use PageSize to build a Dynamic Query.

<apex:selectList value="{!PageSize}" size="1" id="resultLimit">
<apex:selectOption itemValue="5" itemLabel="5"/>
<apex:selectOption itemValue="10" itemLabel="10"/>
<apex:selectOption itemValue="20" itemLabel="20"/>
<apex:selectOption itemValue="30" itemLabel="30"/>
<apex:selectOption itemValue="40" itemLabel="40"/>
</apex:selectList>

Whatever value you select, will be stored in PageSize variable.