How to make a variable accessible to the whole application?

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  • adodotnet20@gmail.com
    #1

    How to make a variable accessible to the whole application?

    I'm developing a Windows application and I'm having some problems in
    making variable accessible to the whole application. I use VS.NET 2005
    and I create a database connection object in the method private void
    connect_Click(o bject sender, EventArgs e). That object I create seems
    to be accessible only within that method, how do I make it accessible
    to the whole application, just like I have access to mytextbox.text
    throughout my tabbed form? Where do you keep your connection object
    usually?

    Thank you.

    Tags: None
    • Mr Icekirby
      #2
      RE: How to make a variable accessible to the whole application?

      C# does not support global variables. You can declare variables outside of
      functions. These are called member variables.

      class Fake
      {
      public int MyInt;
      }

      Anything accessing Fake.MyInt can read it. If you have a function in the
      class, it can also read MyInt.

      "adodotnet20@gm ail.com" wrote:
      I'm developing a Windows application and I'm having some problems in
      making variable accessible to the whole application. I use VS.NET 2005
      and I create a database connection object in the method private void
      connect_Click(o bject sender, EventArgs e). That object I create seems
      to be accessible only within that method, how do I make it accessible
      to the whole application, just like I have access to mytextbox.text
      throughout my tabbed form? Where do you keep your connection object
      usually?
      >
      Thank you.
      >
      >

        Comment

        • Ben Voigt
          #3
          Re: How to make a variable accessible to the whole application?


          <adodotnet20@gm ail.comwrote in message
          news:1162924843 .343653.111310@ h48g2000cwc.goo glegroups.com.. .
          I'm developing a Windows application and I'm having some problems in
          making variable accessible to the whole application. I use VS.NET 2005
          and I create a database connection object in the method private void
          connect_Click(o bject sender, EventArgs e). That object I create seems
          to be accessible only within that method, how do I make it accessible
          to the whole application, just like I have access to mytextbox.text
          throughout my tabbed form? Where do you keep your connection object
          usually?
          You would do that with a class member variable.

          You are not ready for database access if you are unfamiliar with basic
          programming concepts such as scope. I suggest that you complete a tutorial
          that teaches structured programming and object-oriented programming in C#
          before continuing work on your application.
          >
          Thank you.
          >

            Comment

            • C# Beginner
              #4
              Re: How to make a variable accessible to the whole application?

              I'm one of those guys who don't like public variables. My solution is this:
              Create a database class in which you store database members such as
              connectionstrin g property/variable, Open() methods etc. In the starting form
              I create an instance of this database class. When another form needs access
              to the database, I parse the instance using the tag property tag of the
              form.

              NewForm.Tag = (object) myDatabase;

              Within the new form you can use
              .... = (Database) this.tag.

              hope you can use it

              DD
              <adodotnet20@gm ail.comschreef in bericht
              news:1162924843 .343653.111310@ h48g2000cwc.goo glegroups.com.. .
              I'm developing a Windows application and I'm having some problems in
              making variable accessible to the whole application. I use VS.NET 2005
              and I create a database connection object in the method private void
              connect_Click(o bject sender, EventArgs e). That object I create seems
              to be accessible only within that method, how do I make it accessible
              to the whole application, just like I have access to mytextbox.text
              throughout my tabbed form? Where do you keep your connection object
              usually?
              >
              Thank you.
              >

                Comment

                • Peter Bromberg [C# MVP]
                  #5
                  RE: How to make a variable accessible to the whole application?

                  Just add a separate class file to your application and add in all the
                  required fields as public with the "static" modifier.
                  Then you can refer to these from anywhere with "MyStuff.FieldN ame".
                  Peter
                  --
                  Co-founder, Eggheadcafe.com developer portal:
                  http://www.eggheadcafe.com

                  UnBlog:
                  Peter Bromberg's UnBlog
                  http://petesbloggerama.blogspot.com
                  Blog, Peter Bromberg, programming, unblog





                  "adodotnet20@gm ail.com" wrote:
                  I'm developing a Windows application and I'm having some problems in
                  making variable accessible to the whole application. I use VS.NET 2005
                  and I create a database connection object in the method private void
                  connect_Click(o bject sender, EventArgs e). That object I create seems
                  to be accessible only within that method, how do I make it accessible
                  to the whole application, just like I have access to mytextbox.text
                  throughout my tabbed form? Where do you keep your connection object
                  usually?
                  >
                  Thank you.
                  >
                  >

                    Comment

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