combobox problem

Question

i have,lets say unexpected problem with combo box.Here is the problem,i set datasource for my combo box and its display wanted column fine,but when i select ex. third member i shows me that i have  selected the first one.maybe i didn't explain it very well so here is the code :

 

strID = ComboBox1.SelectedValue.ToString 
txtBox.text=strID

summary : it's like i always select first member from combo box collection.if anyone had problem like this please respond .

Answer 1

hello：）

Plz check that your ValueMember is set correctly……Sample looks like this：

namespace WinFormCSharp
{
    public partial class Form1 : Form
    {
        ComboBox cbox = new ComboBox();
        public Form1()
        {
            InitializeComponent();
           
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           
            cbox.Parent = this;
            cbox.Dock = DockStyle.Top;

            Button btn = new Button();
            btn.Parent = this;
            btn.Dock = DockStyle.Bottom;

            //Binding things
            cbox.DataSource = new[] { new { Id = 1, Name = "Name1" }, new { Id = 2, Name = "Name2" } };
            cbox.DisplayMember = "Name";
            cbox.ValueMember = "Id";
            cbox.DropDownStyle = ComboBoxStyle.DropDownList;
            btn.Text = "Click Me";
            btn.Click += new EventHandler(btn_Click);
        }

        void btn_Click(object sender, EventArgs e)
        {
            MessageBox.Show(cbox.SelectedValue.ToString());
        }
    }
}

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Answer 2

i have,lets say unexpected problem with combo box.Here is the problem,i set datasource for my combo box and its display wanted column fine,but when i select ex. third member i shows me that i have  selected the first one.maybe i didn't explain it very well so here is the code :

 

strID = ComboBox1.SelectedValue.ToString 
txtBox.text=strID

SelectedValue is ONLY used when you define "ValueMember" to comboBox. This is in case when you have for example Name and ID columns, Name is DisplayMember (this is actually displayed in comboBox - what you see), and when ID is a ValueMember (you dont see it, but you can use it in your code).

So if you didnt set these 2 properties, you cannot use SelectedValue, BUT only SelectedItem. So in your case, simply replace SelectedValue with SelectedItem and add ToString() method in the end.

Simply, isn`t it?

---

Mitja

Answer 3

 thanks a lot... :)

Answer 4

You are welcome. 

So have you salved the problem? Is it working now?

---

Mitja

Answer 5

Yes, i solved it.

Works fine now.

Answer 6

Yes, i solved it.

Works fine now.

If possible，plz mark us answers……:-)

---

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Answer 7

 thanks a lot... :)

You should also mark mine as an answer……：）

---

   QQ我：
下载MSDN桌面工具(Vista,Win7)
我的博客园
慈善点击，点击此处