Send item in listbox to a single cell in database

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I have a listbox, I want every item in this box to be sent to a single cell, using commas to separate each item. I'm quite new to this, can anyone help. so far I have...

for (int i = 0; i < CustLB.Items.Count; i++)
{
    ListItem item = new ListItem();
    item.Text = CustLB.Items[i].Text;
    item.Value = CustLB.Items[i].Value;
    OleDbCommand lct = new OleDbCommand("UPDATE [Or] SET [Loc] = (@Loc)", MAcon);
    cmd.Parameters.AddWithValue("@Loc", ",");
    cmd.ExecuteNonQuery();

}

What I have tried:

string value = "";

for (int i = 0; i < CustLB.Items.Count; i++)
{
    if (value != "")
    {
        OleDbCommand lct = new OleDbCommand("UPDATE [Or] SET [Loc] = (@Loc)", MAcon);
        cmd.Parameters.AddWithValue("@Loc", value += ",");

    }
    value += CustLB.Items[i].Text;
}
// Now you have all the values in comma (,) separated string.

string[] arr = value.split(',');

Posted 12-Apr-18 5:09am

Member 13765884

Updated 12-Apr-18 16:48pm

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BillWoodruff 12-Apr-18 14:27pm

This appears to be part of another question, posted after this one. I suggest you edit them into one question.

My sense is that you need to spend some time learning the basics of use of data structures in WinForms, and C# programming in general.

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Maciej Los · Answer 1 · 2018-04-12T05:49:00

You should avoid of using OR as a field name. It's reserved word[^] in most databases!

If you would like to build comma separated string value, check this:

C#

string commaVal = string.Join(",", CustLB.Items.Cast<object>()
			.Select(x=> x.ToString()));

OleDbCommand lct = new OleDbCommand("UPDATE [Or] SET [Loc] = @Loc", MAcon);
cmd.Parameters.AddWithValue("@Loc", commaVal ",");

Another way is to use StringBuilder[^].
Why? Because string[^] is immutable!

C#

//create new instance of StringBuilder
StringBuilder sb = new StringBuilder();
foreach(object o in CustLB.Items)
{
   //append string
   sb.Append(string.Format("{0},", o.ToString));
}
//finally
string loc = sb.ToString();

BillWoodruff · Answer 2 · 2018-04-12T08:44:00

Solution 2

To get a String[] of ListBox Items:

string[] lbItemsAsStrArray = listBox1.Items.Cast<string>().ToArray();

I wonder if you are using a ListView here, rather than a ListBox.

Posted 12-Apr-18 8:44am

BillWoodruff

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Member 13765884 12-Apr-18 14:54pm

I'm using a listbox here

Wendelius · Answer 3 · 2018-04-12T16:49:00

If I understand the question correctly, you're trying to build an IN list in the WHERE clause. If this is the case, perhaps something like

C#

OleDbCommand lct = new OleDbCommand("UPDATE [Or] SET [Loc] IN ", MAcon);
string inContent = "";

for (int i = 0; i < CustLB.Items.Count; i++) {
   inContent += $"@loc{i},";
   lct.Parameters.AddWithValue($"@loc{i}", CustLB.Items[i].ToString());
}
inContent = inContent.TrimEnd(',');
lct.CommandText += $"({inContent})";

Also as already pointed out, try to avoid reserved words in names.

Send item in listbox to a single cell in database

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