Error when try to retrive username in asp.net c#

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C#

ASP.NET

SQL

Visual-Studio

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Ok i think ive got the code right but im getting this error when i run the program, Data type mismatch in criteria expression.

{
           da.InsertCommand = new OleDbCommand("INSERT INTO Rented (DVDID, UserName) VALUES (@rent, @username)", conn);
           var currentUser = System.Web.Security.Membership.GetUser(User.Identity.Name);
           string username = currentUser.UserName; //** get UserName
          // string userName = Environment.UserName;


           da.InsertCommand.Parameters.AddWithValue("@rent", DG_Latest.SelectedRow.Cells[1].Text);
           da.InsertCommand.Parameters.AddWithValue("@username", currentUser.UserName);

           conn.Open();

           da.InsertCommand.ExecuteNonQuery();

           conn.Close();
           conn.Dispose();
       }