CODEWITHSUNDEEP
c#winformscombobox
Naourass Derouichi
Naourass Derouichi

Reputation: 793

Retrieve Value/Name of selected item of comboBox

I'm working on a winforms application, I have a comboBox that I bind from a database, each item have a Name and a Value:

 // New item class
 public class themeS
 {
     public string Name { get; set; }
     public string Value { get; set; }
     public override string ToString() { return this.Name; }
 }

 // Binding ComboBox Event
 using (DbEntities db = new DbEntities())
 {
    comboBox2.Items.Clear();
    IEnumerable tem  = from t in db.Themes where t.idCategorie == 1  select t;
    foreach (Themes Tem in tem)
    {
        comboBox2.Items.Add(new themeS { Value = Tem.idTheme.ToString(), Name= Tem.nomTheme });
    }
 }

Now I want to retrieve the Value of selected item of combobox:

string curentIdTem = comboBox2.SelectedValue.ToString();

The returned value of comboBox2.SelectedValue is always 'NULL', can someone help please?

Upvotes: 1

Views: 13976

Answers (3)

sa_ddam213
sa_ddam213

Reputation: 43636

If you want to use SelectedValue you need to set the ValueMember on the ComboBox

Example:

   comboBox1.ValueMember = "Value";
   .....

   int value = (int)comboBox2.SelectedValue;

Upvotes: 1

dotINSolution
dotINSolution

Reputation: 234

Try this:

int curentIdTem =  Convert.ToInt32(((themeS)comboBox2.SelectedItem).Value);

Upvotes: 1

jacob aloysious
jacob aloysious

Reputation: 2597

You are casting a class themeS to an int which would not work.

If you are expecting an int value in the Value property in themeS class.

Then you could retrieve it this way: Int32.TryParse

    int currentItem = 0;
    Int32.TryParse(((themeS)comboBox2.SelectedValue).Value, out     currentItem);

Upvotes: 1

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