OAuth - Service cloud stucked while acquiring token using .net addins

Content

Hi

On button click I need to Acquire Access token and using that token. Have to make Rest APi calls.

While acquiring the token itself the service cloud stucked and unable to perform any operation. I

Attached code please provide me a solution.

ThanksInAdvance.

Code Snippet

             private void button1_Click(object sender, EventArgs e)
        {
            authContext = new AuthenticationContext(authority);
            clientCredential = new ClientCredential(clientId, appKey);

            PostTodo().Wait();
        }

        static async Task PostTodo()
        {
            AuthenticationResult result = null;
            try
            {
                result = await authContext.AcquireTokenAsync(ResourceID, clientCredential);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
}