Getting list of all sql server instances on the network in C#

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C#

WinForms

C#4.0

Dear Experts,

For getting the list of sql servers instances on the i am using the below code.

SqlDataSourceEnumerator instance = SqlDataSourceEnumerator.Instance; 
public DataTable GetInstances()
        {
           
       DataTable dtInstancesList = new DataTable();
       dtInstancesList = instance.GetDataSources().Select("", "ServerName ASC").CopyToDataTable();
            
        return dtInstancesList;
        }

I am getting the server list, its working fine.
But the problem here is,
In my network we are having two domains like A and B.

1. If i run this code in Domain A:
I am getting full list of SQL server instances.
for example here i am getting count is 100

2. If i run the same code in Domain B:
I am not getting the full list of SQl server instances.
for example here i am getting count is 10

Why this is happening, please let me know the solution.