Conversion failed when converting the varchar value " doctor name1 '' to data type int. in c#

private void txt_Search_TextChanged(object sender, EventArgs e)
       {
           try
           {

               con.Open();
               s = " select R_Number , R.P_id , Patients.P_Name  , 
                   convert(varchar,Date_Reservation,105)as ,  ";
               s = s + " DoctorTest.Doctor_Name , ExamType.Exame_Type, R.Notes
                     ";
               s = s + " from ResrvationData R ";
               s = s + " inner join Patients on R.P_id = Patients.P_id ";
               s = s + " inner join DoctorTest on R.Doctor_id = 
                       DoctorTest.Doctor_id ";
               s = s + " inner join ExamType on R.Exame_id = ExamType.Exame_id 
                       ";
               s = s + " Where R_Number + R.P_id + Patients.P_Name  + 
                       DoctorTest.Doctor_Name +  ExamType.Exame_Type like '%" 
                       + txt_Search.Text + "%' and Date_Reservation = 
                       '" + dateTimePicker1.Text + "' and 
                       ExamType.Exame_Type = '" + textBox1.Text + "'
                       ";
               sdAdapter = new SqlDataAdapter(s, con);
               dt = new DataTable();
               sdAdapter.Fill(dt);
               dataGridView_ReservationList.DataSource = dt;
               con.Close();
           }
           catch
           {
               return;
           }
       }