accessing variable of one window form to another

accessing variable of one window form to another

• akula

  I suggest not to define Windows Forms controls as static, cause it will give problems when redrawing and editing, cause those things depend on the parent control (like visibility, etc).
  
  
  

• Öz.Net

  First of all, the first form should know the instance of the form that contains the dataset, so when creating the form, you put it somewhere accessible in the first form.

  namespace WindowsApplication1
  {
  public partial class Form1 : Form
  {
  Form2 _OtherForm;
  public Form1()
  {
  InitializeComponent();
  _OtherForm = new Form2();
  _OtherForm.Show();
  }
  }
  }

  Then, in the Designer set the dataset designer property "Modifiers" on the other form as Public.

  Now you'll be able to access the dataset from your first form, in my example trough _OtherForm.whateverthenameofthedatasetis

  
  
  

• CharlesL

  1) mark the variabile as public
  
  
  

• mcl2

  Would it not be better to contain the dataset in a seperate class This way, you wouldn't have to worry about accessing a form from another form. If you used a static class, the dataset could be shared with all forms that have access to that class without instantiating it.
  
  

• ALi YUKSEL

  Hi Kaetemi,

  Thanks for your support.

  Please be clear, I am not getting eaxctly.

  Thank you

  
  

• badandybad

  public partial class Form1 : Form
  {
  Form2 _OtherForm;
  public Form1()
  {
  InitializeComponent();
  _OtherForm = new Form2();
  _OtherForm.Show();
  DataSet _PublicDataset = _OtherForm.dataSet1;
  DataSet _PublicStaticDataset = Form2.dataSet2;
  }
  }
  
  
  

• dreamlordzwolf - Michael Corpuz

  Hi,

  Thanks.

  If I define dataset as following into one from "Form1" as:

  public static DataSet dsName = new DataSet();

  and then bind this dataset with some table from database.

  Then we cant access this dataset into another form say "From2".

  Is this not the perfect method

  Thank you

  
  

• Vander

  I agree with WreckinCrew.

  Here is how I do it typically. Create a public static class called Global.cs or something. I typically have a file like this in a DataLayer project to keep things seperate but how you want to organize your project is up to you. In this Global file do something like this:

  using System;

  using System.Collections.Generic;

  using System.Text;

  using System.Data;

  namespace WindowsApplication3

  {

  public static class Global

  {

  private static CustomerDataSet _customers = null;

  public static CustomerDataSet Customers

  {

  get

  {

  if (_customers == null)

  {

  CustomerDataSetTableAdapters.CustomerTableAdapter ta = new WindowsApplication3.CustomerDataSetTableAdapters.CustomerTableAdapter();

  CustomerDataSet.CustomerDataTable dt = ta.GetData();

  _customers = new CustomerDataSet();

  _customers.Customer.Merge(dt);

  }

  return _customers;

  }

  }

  }

  }

  There are two variables, one private and one public. One is used to check if data has already been loaded this way you will not be querying the database each time you access the dataset. You can change the logic to suit your needs.

  In the Form_Load of whichever form you want to show the data on it is pretty simple then assuming you have a DataSet object, DataGridView, and a BindingSource all setup prior. Here is the Form_Load:

  private void Form1_Load(object sender, EventArgs e)

  {

  this.customerDataSet.Merge(Global.Customers);

  }

  I'm a firm believer in seperating data, business logic, and things out. As I tell people all the time, what happens if someone says, hey this app you built is great, can you build us a Mobile version of it now You'll have a much easier time doing so if you seperate things initially since your application is simply an interface and everything else is seperate. Just my $.02. Hope this helps.

  -The Elder

  
  
  

• ipointer

  Hi,

  I am not asking for Window Controls. My concern is with Dataset defined into .cs file of Form1. There is not any other way instead of static.

  Thank you

  
  

• salimk786

  It's basically the same, if you set something as static on a form (or in just any class) it will result in exactly the same object on each instance of the form.
  
  And if you use static, you just do Form2.datasetname. You don't get the static things when typing forminstancename.
  
  
  
• accessing variable of one window form to another