How do I select a particular item from combobox via coding

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I want to select a particular item from combobox containing 'n' items, so that i can display that item on combobox while form is running.
note: i have stored the 'n' items in an array and then added them to combobox using datasource
like :

comboBox1.DataSource = array1;

code sample:

 string[] array2 = new string[3] { "10:00", "16:00", "22:00" };
            string[] array1 = new string[3] { "8:30", "13:30", "19:00" };
            if (no == 1 || no == 3)
            {
                comboBox1.DataSource = array1;
            }
            if (no == 2 || no == 4)
            {
                comboBox1.DataSource = array2;
            }
            if (visit == 1 && j != -1)//here is the problem it
            {
                comboBox1.SelectedIndex = j;
            }
//j has a value say 1, so it should display 13:30 for 'no'=1 or 3
but it dosent

What I have tried:

i have tried selectedindex, selectedvalue, selectedtext, selecteditem but nothing works it always displays index 0 item (i.e first item).
Also it dosent gives an error but dosent change the displayed item in combobox its always the first item

Posted 12-Jun-17 23:37pm

chinu1d

Updated 13-Jun-17 1:27am

v2

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Richard MacCutchan 13-Jun-17 6:20am

Nothing works? What does that mean? Please show your code so people can help you, we cannot guess what you are doing.

[no name] 13-Jun-17 6:40am

And while we are at it, 'C#' does not really tell us what control we are talking about. WinForms? WPF? Silverlight? ASP .Net?

Richard MacCutchan 13-Jun-17 6:43am

I don't think you meant to ask me that question.

[no name] 13-Jun-17 7:19am

Not important anyway. As I see, quite a few psycics already have written answers. :-)

And I got to get used to looking for the invisible 'reply' button instead of using the first thing I see :-)

chinu1d 13-Jun-17 7:26am

string[] array2 = new string[3] { "10:00", "16:00", "22:00" };
string[] array1 = new string[3] { "8:30", "13:30", "19:00" };
if (no == 1 || no == 3)
{
comboBox1.DataSource = array1;
}
if (no == 2 || no == 4)
{
comboBox1.DataSource = array2;
}
if (visit == 1 && j != -1)//here is the problem it
{
comboBox1.SelectedIndex = j;
}
//j has a value say 1, so it should display 13:30 for 'no'=1 or 3
but it dosent

Richard MacCutchan 13-Jun-17 11:02am

I just tried that code and it works fine. What is the value of visit?

3 solutions

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lekhasreekrishna@gmail.com · Answer 1 · 2017-06-13T00:17:00

if the items in your ComboBox are strings, you can try:
comboBox1.SelectedItem = "test1";

If the above is not working then try with following method
 
public static void SelectItemByValue(this ComboBox cbo, string value)
{
    for(int i=0; i < cbo.Items.Count; i++)
    {
        var prop = cbo.Items[i].GetType().GetProperty(cbo.ValueMember);
        if (prop!=null && prop.GetValue(cbo.Items[i], null).ToString() == value)
        {
             cbo.SelectedIndex = i;
             break;
        }
    } 
}
Then just consume the method:

ddl.SelectItemByValue(value);

RickZeeland · Answer 2 · 2017-06-13T00:21:00

Maybe you need something like:

C#

comboBox1.DataBindings.Add(new System.Windows.Forms.Binding("SelectedValue", bsCustomers, "id", true));

See this question: c# - Set SelectedItem on a combobox bound to datasource - Stack Overflow[^]
Also there might be a problem with some property you changed in the Forms designer, just try your code with a fresh Form and a ComboBox with default properties.

OriginalGriff · Answer 3 · 2017-06-13T00:25:00

Solution 3

Works for me:

public class MyObject
    {
    public string Text { get; set; }
    public int Value { get; set; }
    }
private void MyButton_Click(object sender, EventArgs e)
    {
    MyObject[] data = new MyObject[] {new MyObject(){Text = "abc", Value = 1},
                                      new MyObject(){Text = "def", Value = 2},
                                      new MyObject(){Text = "ghi", Value = 3}};
    myComboBox.DataSource = data;
    myComboBox.ValueMember = "Value";
    myComboBox.SelectedValue = 2;

Or

myComboBox.SelectedItem  = data[1];

Or

myCOmboBox.SelectedText  = "abc";

So what am I doing that is different to you?

Posted 13-Jun-17 0:25am

OriginalGriff

Comments

[no name] 13-Jun-17 6:43am

-- So what am I doing that is different to you?

He uses ASP .Net MVP. Just joking, but how do you all know what UI he is actually talking about?

OriginalGriff 13-Jun-17 7:18am

I don't. But it's a starting point for him to understand that it does work somewhere... :laugh:

My personal guess is that he has an array of strings, which won't work as a data source (since they only have a Length property) - I could be wrong though.

chinu1d 13-Jun-17 7:29am

But i have tried it it dosent seems to work,
maybe i will try again

OriginalGriff 13-Jun-17 7:36am

What are we doing that is different?

chinu1d 13-Jun-17 7:41am

see my code

OriginalGriff 13-Jun-17 7:46am

What does the debugger say is happening when you step through the code?

chinu1d 13-Jun-17 9:53am

nothing, it executes smoothly but it just keeps on displaying first item in combobox.

How do I select a particular item from combobox via coding

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