How to specify where the path of the json file is in C#?

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C#

reflection

path

I have 3 projects under my solution. One of them is the main base project where I want to have the json file "Testdata.json".

I have to use this file across all 3 projects.. How can I get the path dynamically without hard coding it, and avoid putting it all 3 projects.

//Update:
As OriginalGriff mentioned I have created a public static method to write to the json file and read it and return it, in my main project "Project1" which is Referenced by the other two project.

//This is in Project1

public class JsonDataProvider
    {
        public static string filePath;

        public static string writeToJson(IRestResponse response)
        {
            string json = response.Content;
            string path = System.Reflection.Assembly.GetCallingAssembly().CodeBase;                                                                                                                                               
            string actualPath = path.Substring(0, path.LastIndexOf("bin"));
             string projectPath = new Uri(actualPath).LocalPath;
              filePath = projectPath + @"TestData.json";
            File.WriteAllText(filePath, json);

             string data = GetData();

            return data;
            

        }

        public static string GetData()
        {
            string data = File.ReadAllText(filePath);

            return data;
        }

      
    }

//In my "Project2" I am using this..

[Test]
public void GetAPITest()
{
      restResponse =  HttpGet();
 string expectedJson =JsonDataProvider.writeToJson(restResponse);
}

What I have tried:

I have tried .GetCallingAssembly but this way I have to the json file in every project.

string path = System.Reflection.Assembly.GetCallingAssembly().CodeBase;
string actualPath = path.Substring(0, path.LastIndexOf("bin"));
string projectPath = new Uri(actualPath).LocalPath;
string fileToRead = projectPath + @"TestData.json";

Also tried

string path = Path.Combine(Directory.GetParent(System.IO.Directory.GetCurrentDirectory()).Parent.Parent.Parent.FullName, "TestData.json");

but I get path = C:\Users\TestData.json , Exception: System.UnauthorizedAccessException : Access to the path 'C:\Users\TestData.json' is denied.