Getting item count and reference from ComboBox

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Hello guys,
I bumped into another difficulty with ComboBoxes :) Will be easy one for you.

I have an application with multiple ComboBoxes. The values from these ComboBoxes are taken from an XML file which is stored on yet another computer. The values are displayed ok, but when I try to pull out the item count - I get "0".

MessageBox.Show(ComboBox_Name.Items.Count.ToString());

Am I using wrong function for this purpose?

Update:

If I try to count the items that are stored manually - I get good values:

C#

CB1.Items.Add("Item #1");
CB1.Items.Add("Item #2");
CB1.Items.Add("Item #3");
CB1.Items.Add("Item #4");
CB1.Items.Add("Item #5");

MessageBox.Show(BC1.Items.Count.ToString());
//this would give me a message showing "5"
//If I do the same with CB1 (with values populated from XML file). I get "0"

Thanks!

Posted 8-Jul-13 22:41pm

MK-Gii

Updated 8-Jul-13 23:14pm

v2

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Comments

praks_1 9-Jul-13 4:49am

Check if its not refer to any other combobox means references

MK-Gii 9-Jul-13 4:56am

What do you mean by that? If you're asking if the same list from XML file is not being used by other ComboBoxes - then yes - the same list is being used in many comboboxes. And in the example above I am referencing combobox by name - it's unique and is not repeating anywhere else (otherwise I would get an error).

praks_1 9-Jul-13 5:08am

It won,t give u an error check what u mean by referencing or else post ur question in right manner

MK-Gii 9-Jul-13 6:18am

Ouch...
Looks like someone has get up on the wrong side of the bed :)
Chill out bro and don't sh** your pants ;]

7 solutions

Solution 3

It works for me
string [] languages = new string[2];
languages[0] = "English";
languages[1] = "German";
DataSet myDataSet = new DataSet();

// --- Preparation
DataTable lTable = new DataTable("Lang");
DataColumn lName = new DataColumn("Language", typeof(string));
lTable.Columns.Add(lName);
for (int i = 0; i < languages.Length; i++)
{
DataRow lLang = lTable.NewRow();
lLang["Language"] = languages[i];
lTable.Rows.Add(lLang);
}
myDataSet.Tables.Add(lTable);

// --- Handling the combobox
comboBox1.DataSource = myDataSet.Tables["Lang"].DefaultView;
comboBox1.DisplayMember = "Language";

MessageBox.Show(comboBox1.Items.Count.ToString());
If it is not helpful for you, can you post your code?

Posted 8-Jul-13 22:56pm

Mukesh Ghosh

Solution 5

It works for me
string [] languages = new string[2];
languages[0] = "English";
languages[1] = "German";
DataSet myDataSet = new DataSet();

// --- Preparation
DataTable lTable = new DataTable("Lang");
DataColumn lName = new DataColumn("Language", typeof(string));
lTable.Columns.Add(lName);
for (int i = 0; i < languages.Length; i++)
{
DataRow lLang = lTable.NewRow();
lLang["Language"] = languages[i];
lTable.Rows.Add(lLang);
}
myDataSet.Tables.Add(lTable);

// --- Handling the combobox
comboBox1.DataSource = myDataSet.Tables["Lang"].DefaultView;
comboBox1.DisplayMember = "Language";

MessageBox.Show(comboBox1.Items.Count.ToString());
If it is not helpful for you, can you post your code?

Posted 8-Jul-13 22:56pm

Mukesh Ghosh

Solution 1

Hi,
Check this out:
http://www.c-sharpcorner.com/uploadfile/mahesh/combobox-in-C-Sharp/[^]

Posted 8-Jul-13 22:54pm

praks_1

Comments

MK-Gii 9-Jul-13 5:10am

Thanks for link but it's not what I have. If I have the items stored manually - then the Count return good value. If I get the items from an XML - it gets wrong Count value.
I have updated my Question at the top with more code samples.

Solution 2

It works for me
string [] languages = new string[2];
languages[0] = "English";
languages[1] = "German";
DataSet myDataSet = new DataSet();

// --- Preparation
DataTable lTable = new DataTable("Lang");
DataColumn lName = new DataColumn("Language", typeof(string));
lTable.Columns.Add(lName);
for (int i = 0; i < languages.Length; i++)
{
DataRow lLang = lTable.NewRow();
lLang["Language"] = languages[i];
lTable.Rows.Add(lLang);
}
myDataSet.Tables.Add(lTable);

// --- Handling the combobox
comboBox1.DataSource = myDataSet.Tables["Lang"].DefaultView;
comboBox1.DisplayMember = "Language";

MessageBox.Show(comboBox1.Items.Count.ToString());
If it is not helpful for you, can you post your code?

Posted 8-Jul-13 22:56pm

Mukesh Ghosh

Solution 4

It works for me
string [] languages = new string[2];
languages[0] = "English";
languages[1] = "German";
DataSet myDataSet = new DataSet();

// --- Preparation
DataTable lTable = new DataTable("Lang");
DataColumn lName = new DataColumn("Language", typeof(string));
lTable.Columns.Add(lName);
for (int i = 0; i < languages.Length; i++)
{
DataRow lLang = lTable.NewRow();
lLang["Language"] = languages[i];
lTable.Rows.Add(lLang);
}
myDataSet.Tables.Add(lTable);

// --- Handling the combobox
comboBox1.DataSource = myDataSet.Tables["Lang"].DefaultView;
comboBox1.DisplayMember = "Language";

MessageBox.Show(comboBox1.Items.Count.ToString());
If it is not helpful for you, can you post your code?

Posted 8-Jul-13 22:56pm

Mukesh Ghosh

Solution 6

It works for me
string [] languages = new string[2];
languages[0] = "English";
languages[1] = "German";
DataSet myDataSet = new DataSet();

// --- Preparation
DataTable lTable = new DataTable("Lang");
DataColumn lName = new DataColumn("Language", typeof(string));
lTable.Columns.Add(lName);
for (int i = 0; i < languages.Length; i++)
{
DataRow lLang = lTable.NewRow();
lLang["Language"] = languages[i];
lTable.Rows.Add(lLang);
}
myDataSet.Tables.Add(lTable);

// --- Handling the combobox
comboBox1.DataSource = myDataSet.Tables["Lang"].DefaultView;
comboBox1.DisplayMember = "Language";

MessageBox.Show(comboBox1.Items.Count.ToString());
If it is not helpful for you, can you post your code?

Posted 8-Jul-13 22:56pm

Mukesh Ghosh

Comments

MK-Gii 9-Jul-13 5:05am

M8 - no need to post the same responce so many times... I read it and the difference is that you're not trying to get the count of ComboBox items which is getting values from XML file...

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OriginalGriff · Accepted Answer · 2013-07-08T22:58:00

Solution 7

Probably not - but it's quite likely you are doing it at the wrong time.
If you are doing it in the same code that you are loading the items into the combobox then it is very likely that the value will be zero because the items are not loaded from the XML file immediately - it waits until the combobox is shown before loading them.

Try moving the code into a button handler, and I bet you get the right number!

Posted 8-Jul-13 22:58pm

OriginalGriff

Comments

MK-Gii 9-Jul-13 6:07am

You're my man! Worked like a charm. I've set the counter to count it after 2 second after program starts. I owe you this!
Silly how I did not though about this...

OriginalGriff 9-Jul-13 6:12am

:laugh:
It's not something you think about until it bites you!