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Sainath VenkatSainath Venkat 

picklist value to default and read only on VF Page

I have a look up field and picklist fields on VF Page,
Look up field is having lookup to Project object, if users selects a Project in lookup field and if Project__c.Account = 'Test' then I want picklist value to be 'No' and disable it.
Can anyone help me out in achieving this on VF Page
AnudeepAnudeep (Salesforce Developers) 
If you are using apex:selectList, you can use disabled attribute and disable the picklist (disabled="{!bool}"/>)

Code snippets below are just samples 
public class sample
{  
  
    public Boolean bool {get;set;}

    public void demo()
    {
        if(Project__c.Account=='Test')
        {
            bool = true;
        }
        else
        {
            bool = false;
)

You can then add a new value to picklist based on the condition 
Public List<SelectOption> getCon(){
 List<SelectOption> conOptions = new List<SelectOption>();      
 if(Project__c.Account == 'Test'l){
    
    conOptions.add(new(selectoption('No','No');
 }
}

If you find this information helpful, please mark this answer as Best. It may help others in the community. Thank You!

Anudeep