Additional text encountered after finished reading JSON content: ; . Path '', line 1, position 46."" please help...

""An exception of type 'Newtonsoft.Json.JsonReaderException' occurred in Newtonsoft.Json.dll but was not handled in user code.

public void Button1_Click(object sender, EventArgs e)
        {
           
            string myDynamicJSON = jsontb.Text;
            

            //Using dynamic keyword with JsonConvert.DeserializeObject, here you need to import Newtonsoft.Json  
            dynamic myObject = JsonConvert.DeserializeObject(myDynamicJSON);

            //Binding gridview from dynamic object   
            GridView1.DataSource = myObject;
            GridView1.DataBind();

            //Using DataTable with JsonConvert.DeserializeObject, here you need to import using System.Data;  
            DataTable myObjectDT = JsonConvert.DeserializeObject<datatable>(myDynamicJSON);

            //Binding gridview from dynamic object   
            GridView1.DataSource = myObjectDT;
            GridView1.DataBind();
        }