Help Search Data on Web API using Windows Form

[Xlayer]

Ano kayang tamang query dito sa pag search ng data sa web api using windows form?
ito yung code ko , pero not found ang result.

var client = new HttpClient();
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", AppSetting.Default.TOKEN);
            var response = await client.GetAsync($"http://xlayer-001-site1.dtempurl.com/api/Students/StudentList" +txtsearch.Text);
            if (response.IsSuccessStatusCode)
            {
                string contentresponse = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
                dataGridView1.DataSource = JsonConvert.DeserializeObject<List<Students>>(contentresponse);
            }
            else
            {
                MessageBox.Show(response.StatusCode.ToString());

            }

 

[agentbayabas04]

nice lods