Hi Swakat,

I am still getting error in my Controller Code  :-

Error is :- Error: dynamicreportscontroller Compile Error: expecting a semi-colon, found '(' at line 41 column 40

public class dynamicreportscontroller {

private Map <String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();
public List <Pair> fields {get; set;}
public List <SelectOption> objectNames {public get; private set;}
public String selectedObject {get; set;}
public String selectedFields {get; set;}
//public List<SelectOption> fieldNames = new List<SelectOption>();
public List<SelectOption> fieldNames {public get; private set;}

// Intialize objectNames and fields
public dynamicreportscontroller() {
objectNames = initObjNames();
fields = new List<Pair>();
fieldNames = getFieldNames();
}

// Populate SelectOption list -
// find all sObjects available in the organization

private List<SelectOption> initObjNames() {
List<SelectOption> objNames = new List<SelectOption>();
List<String> entities = new List<String>(schemaMap.keySet());
entities.sort();
for(String name : entities)
objNames.add(new SelectOption(name,name));
return objNames;
}

// Find the fields for the selected object
public void showFields() {
fields.clear();
Map <String, Schema.SObjectField> fieldMap = schemaMap.get(selectedObject).getDescribe().fields.getMap();
for(Schema.SObjectField sfield : fieldMap.Values()){
schema.describefieldresult dfield = sfield.getDescribe();
Pair field = new Pair();
field.key = dfield.getname();
fields.add(field);
}

private List<SelectOption> getFieldNames() {                  Shows Error in this line
List<SelectOption> fieldNames = new List<SelectOption>();
for(Schema.SObjectField sfield : fieldMap.Values())
{
    schema.describefieldresult dfield = sfield.getDescribe();
    fieldNames.add(new SelectOption(dfield.getName(),dfield.getLabel()));
}
}

public class Pair
{
public String key {get; set;}
public String val {get; set;}
}

}
}

VF Code is :-

<apex:page Controller="dynamicreportscontroller">
<apex:form id="Describe">
<apex:pageBlock id="block2" >
<apex:pageblockbuttons location="top" >
<apex:commandButton value="Get Describe Object Fields" action="{!showFields}"/>
</apex:pageblockbuttons>
<apex:pageblocksection >
<apex:selectList value="{!selectedObject}" size="1">
<apex:selectOptions value="{!objectNames}"/>
</apex:selectList>
</apex:pageblocksection>

<apex:pageblocksection id="fieldList" rendered="{!not(isnull(selectedObject))}">
            <apex:selectList value="{!selectedFields}" multiselect="true">
                <apex:selectOptions value="{!fieldNames}"/>
            </apex:selectList>
</apex:pageblocksection>
</apex:pageBlock>
</apex:form>
</apex:page>