in gridview while inserting data,duplicate data displaying

public void insertjobdata(string NAME, string DESCRIPTION)
      {
          cmd = new SqlCommand("insertjobdata", con);
          cmd.CommandType=CommandType.StoredProcedure;
          cmd.Parameters.Clear();
          cmd.Parameters.AddWithValue("@NAME",NAME);
          cmd.Parameters.AddWithValue("@DESCRIPTION",DESCRIPTION);
          con.Open();
          cmd.ExecuteNonQuery();
          bind();
          con.Close();


      }

public void insertjobdata(string NAME, string DESCRIPTION)
   {
       try
       {
           OBJ.insertjobdata(NAME, DESCRIPTION);
       }
       catch (Exception EX)
       { throw EX; }
   }

private void Tsb_Create_Click(object sender, EventArgs e)
      {
          if (Txt_Name == null)
          { MessageBox.Show("ENTER DEATILS"); }
          try
          {
              obj.insertjobdata(Txt_Name.Text, Txt_Desc.Text);
              MessageBox.Show("inserted");
          }
          catch (Exception EX)
          { throw EX; }

      }

private void jobControl1_Load(object sender, EventArgs e)
     {
         Dgv_Summary.DataSource = obj.gettabledata();
     }