Create Row in gridview.

Question

I want to create a row in gridview as per specified requirement.

 

Here I use this code to create a row,but it creates in all the fields

protected void gvEmployee_RowCreated(object sender, GridViewRowEventArgs e)
       {
           if (e.Row.RowType == DataControlRowType.Footer)
           {
               for (int i = 0; i < e.Row.Cells.Count; i++)
               {
                   TextBox tb = new TextBox();
                   tb.ID = string.Format("txtEntry{0}", i);
                   e.Row.Cells[i].Controls.Add(tb);
                   if (i == e.Row.Cells.Count - 1)
                   {
                       Button btn = new Button();
                       btn.ID = "btnAddNew";
                       btn.Text = "Add Text";
                       btn.Click += btnAddNew_Click;
                       e.Row.Cells[i].Controls.Add(btn);

                   }

               }
           }
       }
       protected void btnAddNew_Click(object sender, EventArgs e)
       {
           Button btn = (Button)sender;
           GridViewRow row = (GridViewRow)btn.NamingContainer;
           if (row != null)
           {
               if (InsertNewEmployee(row))
                   ClientScript.RegisterClientScriptBlock(typeof(Page), "ALERT", "alert('New Record Added.');", true);
               else
                   ClientScript.RegisterClientScriptBlock(typeof(Page), "ALERT", "alert('All field cannot be empty');", true);
           }
           BindGridView(GetAllEmployee());

       }

 

 I want to create row only in 4 fields first name to position only. Please help me with the appropriate code.