public String sel_id{get;set;}
public void DeleteRow()
{
    system.debug('sel_id = ' + sel_id );
    try{
        if(sel_id != null || sel_id != '')
        {
            Color_Coding__c cc = new Color_Coding__c(id=sel_id);

            delete cc;
            RefreshColor();
        }
   }catch(Exception e)
        {
            ApexPages.Message MyMsg = new ApexPages.Message(ApexPages.Severity.ERROR, e.getMessage());
            ApexPages.addMessage(myMsg);
        }
}
public void RefreshColor()
{
    try{
        colorCoding = new List<Color_Coding__c>();
        colorCoding = Color_Coding__c.getAll().Values();
    }catch(Exception e)
        {
            ApexPages.Message MyMsg = new ApexPages.Message(ApexPages.Severity.ERROR, e.getMessage());
            ApexPages.addMessage(myMsg);
        }
}

<apex:repeat value="{!colorCoding}" var="c" >
     <tr>
         <td><apex:inputField value="{!c.Name}"/></td>
         <td><apex:inputField value="{!c.Color_Code__c}"/></td>
         <td><apex:inputField value="{!c.Min_Value__c}"/></td>
         <td><apex:inputField value="{!c.Max_Value__c}"/></td>
         <td><apex:commandLink action="{!DeleteRow}" value="Delete" reRender="pb" immediate="true">
              <apex:param assignTo="{!sel_id}" value="{!c.id}" name="id"/>
              </apex:commandLink></td>
     </tr>
 </apex:repeat>