Hello Morris

I  gave up for about a year ago, when i locate the controll Xceed creates -
look at www.Xceed.com
It cost some, but it's great.

/Johnny Jensen

I have developed a custom combo that can handle 4 bound columns
Let me know if you want to take a look

Hi Morris,

Based on my understanding, you'd like to display multiple columns from
underlying data source in the ListBox or ComboBox. If I'm off base, please
feel free to let me know.

Firstly I don't remember in the prior version of Visual Studio, the ListBox
supported multiple source columns.

The ListBox class has a property named 'MultiColumn' and a multicolumn
ListBox places items into as many columns as are needed to make vertical
scrolling unnecessary.  But this feature isn't relevant to supporting
multiple source columns.

ComboBox doesn't support multiple columns internally.

Actually what you want is to show text from multiple columns form the
underlying data source in a ListBox or ComboBox. A simple workaround is to
add a public property in the data entity class to return a text
representing the multiple columns text and set this new property to the
DisplayMember property of the ListBox or ComboBox.

I will illustrate this by an example.

class Person
{
           private string id;
           private string name;
           private int age;

           public string ID
           {
               get { return id; }
               set { id = value; }
           }
           public string Name
           {
               get { return name; }
               set { name = value; }
           }
           public int Age
           {
               get { return age; }
               set { age = value; }
           }
           // this "Display" property is added only to return a text
representing the values of the 'Name' and 'Age' properties
           public string Display
           {
               get { return (name + " " + age.ToString()); }
           }
           public Person(string id, string name, int age)
           {
               this.id = id;
               this.name = name;
               this.age = age;
           }
}

private void Form1_Load(object sender, EventArgs e)
{
           List<Person> lists = new List<Person>();
           lists.Add(new Person("1","aara",34));
           lists.Add(new Person ("2","bbb",42));
           lists.Add(new Person("3", "ccc", 21));

           this.comboBox1.DataSource = lists;
           this.comboBox1.ValueMember = "ID";
           this.comboBox1.DisplayMember = "Display";

           this.listBox1.DataSource = lists;
           this.listBox1.ValueMember = "ID";
           this.listBox1.DisplayMember = "Display";      
}

Hope this helps.
If my suggestion is not appropriate to your practice, please feel free to
let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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