Adding Combo Box Items

Collapse
This topic is closed.
X
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • vb
    #1

    Adding Combo Box Items

    Hi,
    I am new to .Net.

    I am using a Combo Box in my windows forms. I am adding the items by
    creating the instances and adding the same to the list.
    My questions/doubts are:
    1. If I have 25 to 30 options in each combo box and like that if we have 6
    or 7 combo boxes in a form, isnt it a problem in creating that number of
    instances everytime the form is opened/activated
    2. How do I dispose the Combo Box items.

    Your comments/response is greatly appreciated.

    thanks
    vb
    Tags: None
    • W.G. Ryan eMVP
      #2
      Re: Adding Combo Box Items

      Svae the datasource in a module or a shared property as a class. Then, just
      set the datasource of the combobox to this value - set the displaymember and
      valuemember properties accordingly.

      You're abosultely right though - reloading this each time is a pig - but if
      you just load a dataset at init and then use a shared property, you're good
      to go.

      --
      W.G. Ryan MVP (Windows Embedded)

      TiBA Solutions
      www.tibasolutions.com | www.devbuzz.com | www.knowdotnet.com
      "vb" <vb@discussions .microsoft.com> wrote in message
      news:CA08E539-2EAF-4B75-902B-5FC585014328@mi crosoft.com...[color=blue]
      > Hi,
      > I am new to .Net.
      >
      > I am using a Combo Box in my windows forms. I am adding the items by
      > creating the instances and adding the same to the list.
      > My questions/doubts are:
      > 1. If I have 25 to 30 options in each combo box and like that if we have 6
      > or 7 combo boxes in a form, isnt it a problem in creating that number of
      > instances everytime the form is opened/activated
      > 2. How do I dispose the Combo Box items.
      >
      > Your comments/response is greatly appreciated.
      >
      > thanks
      > vb[/color]


        Comment

        • W.G. Ryan eMVP
          #3
          Re: Adding Combo Box Items

          Svae the datasource in a module or a shared property as a class. Then, just
          set the datasource of the combobox to this value - set the displaymember and
          valuemember properties accordingly.

          You're abosultely right though - reloading this each time is a pig - but if
          you just load a dataset at init and then use a shared property, you're good
          to go.

          --
          W.G. Ryan MVP (Windows Embedded)

          TiBA Solutions
          www.tibasolutions.com | www.devbuzz.com | www.knowdotnet.com
          "vb" <vb@discussions .microsoft.com> wrote in message
          news:CA08E539-2EAF-4B75-902B-5FC585014328@mi crosoft.com...[color=blue]
          > Hi,
          > I am new to .Net.
          >
          > I am using a Combo Box in my windows forms. I am adding the items by
          > creating the instances and adding the same to the list.
          > My questions/doubts are:
          > 1. If I have 25 to 30 options in each combo box and like that if we have 6
          > or 7 combo boxes in a form, isnt it a problem in creating that number of
          > instances everytime the form is opened/activated
          > 2. How do I dispose the Combo Box items.
          >
          > Your comments/response is greatly appreciated.
          >
          > thanks
          > vb[/color]


            Comment

            • Cor Ligthert
              #4
              Re: Adding Combo Box Items

              VB,

              When there is used a datagridcombobo xcolomn, than there are mostly a lot
              more comboboxes as you now tell on a form.

              I never heard a complain in this newsgroup.

              Never think about disposing when you do not need to do it, it can be usefull
              to clear bitmaps something faster because they are mostly huge
              memoryspenders.

              Relaeasing resources is one of the reasons dotNet is made.

              Just my thought,


              Cor

              "vb" <vb@discussions .microsoft.com>
              [color=blue]
              > Hi,
              > I am new to .Net.
              >
              > I am using a Combo Box in my windows forms. I am adding the items by
              > creating the instances and adding the same to the list.
              > My questions/doubts are:
              > 1. If I have 25 to 30 options in each combo box and like that if we have 6
              > or 7 combo boxes in a form, isnt it a problem in creating that number of
              > instances everytime the form is opened/activated
              > 2. How do I dispose the Combo Box items.
              >
              > Your comments/response is greatly appreciated.
              >
              > thanks
              > vb[/color]


                Comment

                • Cor Ligthert
                  #5
                  Re: Adding Combo Box Items

                  VB,

                  When there is used a datagridcombobo xcolomn, than there are mostly a lot
                  more comboboxes as you now tell on a form.

                  I never heard a complain in this newsgroup.

                  Never think about disposing when you do not need to do it, it can be usefull
                  to clear bitmaps something faster because they are mostly huge
                  memoryspenders.

                  Relaeasing resources is one of the reasons dotNet is made.

                  Just my thought,


                  Cor

                  "vb" <vb@discussions .microsoft.com>
                  [color=blue]
                  > Hi,
                  > I am new to .Net.
                  >
                  > I am using a Combo Box in my windows forms. I am adding the items by
                  > creating the instances and adding the same to the list.
                  > My questions/doubts are:
                  > 1. If I have 25 to 30 options in each combo box and like that if we have 6
                  > or 7 combo boxes in a form, isnt it a problem in creating that number of
                  > instances everytime the form is opened/activated
                  > 2. How do I dispose the Combo Box items.
                  >
                  > Your comments/response is greatly appreciated.
                  >
                  > thanks
                  > vb[/color]


                    Comment

                    • Herfried K. Wagner [MVP]
                      #6
                      Re: Adding Combo Box Items

                      "vb" <vb@discussions .microsoft.com> schrieb:[color=blue]
                      > I am using a Combo Box in my windows forms. I am adding
                      > the items by creating the instances and adding the same to
                      > the list.
                      > My questions/doubts are:
                      > 1. If I have 25 to 30 options in each combo box and like that
                      > if we have 6 or 7 combo boxes in a form, isnt it a problem in
                      > creating that number of instances everytime the form is
                      > opened/activated[/color]

                      What problems do you think of? There may be performance problems if you are
                      adding hundreds of items when the form is shown, and maybe there will be
                      memory problems if you are adding a large number of elements.
                      [color=blue]
                      > 2. How do I dispose the Combo Box items.[/color]

                      Simply remove them from the combobox and dispose them, if they implement
                      'IDisposable'.

                      --
                      Herfried K. Wagner [MVP]
                      <URL:http://dotnet.mvps.org/>


                        Comment

                        • Herfried K. Wagner [MVP]
                          #7
                          Re: Adding Combo Box Items

                          "vb" <vb@discussions .microsoft.com> schrieb:[color=blue]
                          > I am using a Combo Box in my windows forms. I am adding
                          > the items by creating the instances and adding the same to
                          > the list.
                          > My questions/doubts are:
                          > 1. If I have 25 to 30 options in each combo box and like that
                          > if we have 6 or 7 combo boxes in a form, isnt it a problem in
                          > creating that number of instances everytime the form is
                          > opened/activated[/color]

                          What problems do you think of? There may be performance problems if you are
                          adding hundreds of items when the form is shown, and maybe there will be
                          memory problems if you are adding a large number of elements.
                          [color=blue]
                          > 2. How do I dispose the Combo Box items.[/color]

                          Simply remove them from the combobox and dispose them, if they implement
                          'IDisposable'.

                          --
                          Herfried K. Wagner [MVP]
                          <URL:http://dotnet.mvps.org/>


                            Comment

                            Previous template Next
                            Working...