Programmatically Check an Item in Checkboxlist where text is equal to what I want

Question

In C#, I am trying to Check an item in a CheckBoxList where the text equals what I require.

I would modify the code to check items that exist in the database.

If you would like an example, I need to select the checklistbox item that equals to abc.

Have you attempted this yourself yet? Is the interface to the CheckBoxList something you dont understand? — Fuzz, Feb 07 '12 at 23:44
Please don't prefix your titles with "C#" and such. That's what the tags are for. — John Saunders, Feb 07 '12 at 23:46
Please see the FAQ regarding signatures in posts. I also removed your thank you line, because it's more likely than not that no one will help since you haven't shown that you've tried to help yourself. — M.Babcock, Feb 07 '12 at 23:46
I have spent the last two hours trying to get ways of working it but i can't seem to figure how to get the checkedListBox.SetItemChecked to relate it to an item in the checklistbox. — Peter Roche, Feb 07 '12 at 23:53

wdavo · Accepted Answer · 2015-03-14T06:24:22.090

45

Assuming that the items in your CheckedListBox are strings:

  for (int i = 0; i < checkedListBox1.Items.Count; i++)
  {
    if ((string)checkedListBox1.Items[i] == value)
    {
      checkedListBox1.SetItemChecked(i, true);
    }
  }

Or

  int index = checkedListBox1.Items.IndexOf(value);

  if (index >= 0)
  {
    checkedListBox1.SetItemChecked(index, true);
  }

edited Mar 14 '15 at 06:24

answered Feb 07 '12 at 23:52

wdavo

5,070
1
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20

It's the value you want to match, E.G. a string literal of "MyValue" – wdavo Feb 19 '15 at 22:03
1

`if(index > 0)` should be `if(index >= 0)`, since IndexOf can return zero if it finds the first item in the list. It returns -1 if the value isn't found. – FireSBurnsmuP Mar 13 '15 at 17:00
Only the first item get checked how to use foreach using this method. – Sunil Acharya Mar 27 '17 at 12:49
I don't see `.SetItemChecked()` as an extension – Si8 May 04 '18 at 16:46

score 10 · Answer 2 · answered Feb 08 '12 at 00:00

10

Example based on ASP.NET CheckBoxList

<asp:CheckBoxList ID="checkBoxList1" runat="server">
    <asp:ListItem>abc</asp:ListItem>
    <asp:ListItem>def</asp:ListItem>
</asp:CheckBoxList>


private void SelectCheckBoxList(string valueToSelect)
{
    ListItem listItem = this.checkBoxList1.Items.FindByText(valueToSelect);

    if(listItem != null) listItem.Selected = true;
}

protected void Page_Load(object sender, EventArgs e)
{
    SelectCheckBoxList("abc");
}

answered Feb 08 '12 at 00:00

Jim Scott

2,493
1
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The FindByText function doesn't exist for me. – Peter Roche Feb 08 '12 at 13:15
Is this an asp.net application? Let me know what version of .NET and what environment and I would be happy to provide you specific instructions. – Jim Scott Feb 08 '12 at 17:33
Hi Jim, I will be using C#.Net in Visual Studio 2010, using Framework 4.0 Client. – Peter Roche Feb 09 '12 at 22:49
Right, but what kind of project? Winform, Silverlight, ASP.NET...? – Jim Scott Feb 10 '12 at 03:58

score 5 · Answer 3 · edited Sep 24 '15 at 22:45

All Credit to @Jim Scott -- just added one touch. (ASP.NET 4.5 & C#)

Refractoring this a little more... if you pass the CheckBoxList as an object to the method, you can reuse it for any CheckBoxList. Also you can use either the Text or the Value.

private void SelectCheckBoxList(string valueToSelect, CheckBoxList lst)
{
    ListItem listItem = lst.Items.FindByValue(valueToSelect);
    //ListItem listItem = lst.Items.FindByText(valueToSelect);
    if (listItem != null) listItem.Selected = true;
}

//How to call it -- in this case from a SQLDataReader and "chkRP" is my CheckBoxList`

SelectCheckBoxList(dr["kRPId"].ToString(), chkRP);`

ardem · Answer 4 · 2018-03-05T08:08:57.667

0

//Multiple selection:

          private void clbsec(CheckedListBox clb, string text)
          {
              for (int i = 0; i < clb.Items.Count; i++)
              {
                  if(text == clb.Items[i].ToString())
                  {
                      clb.SetItemChecked(i, true);
                  }
              }
          }

using ==>

clbsec(checkedListBox1,"michael");

or 

clbsec(checkedListBox1,textBox1.Text);

or

clbsec(checkedListBox1,dataGridView1.CurrentCell.Value.toString());

edited Mar 05 '18 at 08:08

answered Jan 07 '17 at 19:18

ardem

21
5

Add some explanation with answer for how this answer help OP in fixing current issue – ρяσѕρєя K Jan 07 '17 at 19:55

prashant srivastav · Answer 5 · 2019-08-02T21:11:42.827

I tried adding dynamically created ListItem and assigning the selected value.

foreach(var item in yourListFromDB)
{
 ListItem listItem = new ListItem();
 listItem.Text = item.name;
 listItem.Value = Convert.ToString(item.value);
 listItem.Selected=item.isSelected;                 
  checkedListBox1.Items.Add(listItem);
}
checkedListBox1.DataBind();

avoid using binding the DataSource as it will not bind the checked/unchecked from DB.

Programmatically Check an Item in Checkboxlist where text is equal to what I want

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