Dynamic RDL(SSRS) file Generation

I have created .rdl file using C# Asp.Net Core dynamically.

Problem i am facing while loding report in ReportViewer is .rld files's DataSet is not Initialized. or Dataset fields are not refreshed.

I want a solution that how to Initialize or refresh Dataset fileds dynamically whenever .rdl file is created.

I followed bellow link to create .rdl file dynamically 

https://docs.microsoft.com/en-us/previous-versions/sql/sql-server-2008-r2/ms170239(v%3dsql.105)

Waiting for your response.

Thanks in Advance