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i want add value number to first element of of text box [closed]

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txtpayAmount.Text = gblFunction.ConvertTwoDecimal(
txtpayAmount.Text,
btn.Tag.ToString(),
txtpayAmount.SelectedText.Length);
txtpayAmount.Focus();
txtpayAmount.SelectionStart = txtpayAmount.Text.Length;
This is my code , am trying to add the value of button to textbox but its adding as last element of textbox.I want to add as first element

If I understand correctly (your question is confusing), you want prepend the text in a textbox.
If you want to do so you can do a txtBox.Value = 'ValueToPrepend' + txtBox.Value;

Result table more retain single array how can [closed]

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Hi sp returns 2 tables set record how to marge result set.
Result set table 1:
Result set table 2:

dtAll = new DataTable();
...
dtAll.Merge(dtOne);
dtAll.Merge(dtTwo);
dtAll.Merge(dtThree);
...
and so on.
This technique is useful in a loop where you want to iteratively merge data tables:
DataTable dtAllCountries = new DataTable();
foreach(String strCountry in listCountries)
{
DataTable dtCountry = getData(strCountry); //Some function that returns a data table
dtAllCountries.Merge(dtCountry);
}

If iam understanding you correctly
You wish to merge 2 identical data tables
dataTable.Merge(dataTable1);

c# checklistbox check if item is selected [closed]

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It my sound trivial but I can't get around. How do I know if item in checklistbox is selected ? I've got checklistbox with 3 items and I'd like to do some 'if then' statements. Basically ,if chkbox1.Checked Items 'ABC' is selected / checked then..
Thanks

CheckedListBox contains CheckedItems property. You can get all checked items from this collection. Read here: MSDN

got this solved by using
GetItemCheckState(0) == CheckState.Checked
and using 0 first item ,1 second item etc.

Compare two IEnumerable<> Collection data [closed]

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I have two IEnumerable data collections that I would like to compare and get first collection values selected.
Here is what I am trying to do.
ClassA
Column|IsMatched
----
1
2
2
2
3
4
5
ClassB
Column
1
2
7
3
5
2
After comparison, I would like to get following.
ClassA
Column|IsMatched
1 true
2 true
2 true
2 false
3 true
6 false
5 true
4 false
Second collection may be in any order.
Any help to sort this issue would be really appreciated.
Thanks

You could do something like the following:
var workingBag = new List<int>(secondCollection);
var results = firstCollection.Select(i => new ClassA(i, workingBag.Remove(i));

Removing column in a list<T> in linq [closed]

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I have a list I want to remove the column RiskRegisterEntryId and RiskRegisterTypeId how can I to do that..?
SeriesNumber RiskRegisterEntryId RiskRegisterTypeId RiskRegisterType
RCMSRA19111300001 1 1 Site Risk Audit
RCMSRA19111300002 2 1 Site Risk Audit
RCMSRA19111300003 3 1 Site Risk Audit
RCMSRA19111300004 4 1 Site Risk Audit
RCMSRA20111300016 16 1 Site Risk Audit

You can just create a new list of an anonymous type without those columns:
var newList = myList.Select(l => new {
l.SeriesNumber , l.RiskRegisterType
}).ToList();

List.Select(x => new { x.SeriesNumber, x.RiskRegisterType});
This will create a list with an anonymous type containing only those two fields.