Attach a SQL database to ComboBox.ItemSource (WPF)

Question

I want to know how can I assign a SQL Server database to ItemSource property of a ComboBox (in a WPF app). I assigned the data source to the project but do

Answer 1

you can try like this ..you can bind the item source property of combobox like this below..

ItemsSource="{Binding}"

EDIT:

Connection string :

You can add in control event or class but it should be in wpf application window.

If you create new application in visual studio or visual c# or whatever it creates window1.xaml. you need to add connection string basically in class or event in that window1.xaml not in app.config or app.xaml.

connection string define in class:

Here is example by creating a class (its sql connector instead of OleDb which i showed in 1st one):

public class ConnectionHelper
{
    public static SqlConnection GetConnection()
    {
        string connectionStr = "Data Source=MICROSOFT-JIGUO;Initial Catalog=CompanyTestDB;Integrated Security=True";
        SqlConnection conn = new SqlConnection(connectionStr);
        return conn;
    }
}

and you can use this class in your methods:

  SqlConnection conn = ConnectionHelper.GetConnection();

on load function u can assign values to combobox

private void OnLoad(object sender, System.EventArgs e) 
{          
       ListCategories();
}

private void ListCategories()
{
 sqlCon = new SqlConnection();
 sqlCon.ConnectionString = Common.GetConnectionString();
 cmd = new SqlCommand();
 cmd.Connection = sqlCon;
 cmd.CommandType = CommandType.Text;
 cmd.CommandText = "SELECT * FROM Categories";
 sqlDa = new SqlDataAdapter();
 sqlDa.SelectCommand = cmd;
 ds = new DataSet();
 try
 {
     sqlDa.Fill(ds, "Category");
     DataRow nRow = ds.Tables["Category"].NewRow();
     nRow["CategoryName"] = "List All";
     nRow["CategoryID"] = "0";
     ds.Tables["Category"].Rows.InsertAt(nRow, 0);

     //Binding the data to the combobox.
      cmbCategory.DataContext = ds.Tables["Category"].DefaultView;

    //To display category name (DisplayMember in Visual Studio 2005)
      cmbCategory.DisplayMemberPath = 
          ds.Tables["Category"].Columns["CategoryName"].ToString();
    //To store the ID as hidden (ValueMember in Visual Studio 2005)
      cmbCategory.SelectedValuePath = 
          ds.Tables["Category"].Columns["CategoryID"].ToString();

  }
  catch (Exception ex)
  {
      MessageBox.Show("An error occurred while loading categories.");
  }
  finally
  {
      sqlDa.Dispose();
      cmd.Dispose();
      sqlCon.Dispose();
  }

}