To convert datatable to list

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I have a DataTable with multiple columns. I want to get a List<String> of all column of DataTable. How can I do that?

List<string> fields;
foreach (DataRow dr in dt.Rows)
            {
                fields.Add(row[0].ToString());
            }

how can i do this??

Posted 21-Aug-13 22:34pm

rahul55555

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CodeBlack 22-Aug-13 4:38am

Do you want to all rows of all columns into one list List<string> ?

rahul55555 22-Aug-13 4:41am

yeah.. actualy i already have 1st column data into list<string> fields;
the remaining columns are in datatable. i want to get those into list and bind list to gridview

Mohan Gopi 22-Aug-13 6:40am

You know Datatable column Names?... If you know means use below code

List<string> NameList = (from r in dt.AsEnumerable()
select r.Field<datatypeofcolumnname1>("ColumnName1") + r.Field<datatypeofcolumnname2>("ColumnName2")).ToList();

i hope this will solve your problem

rahul55555 22-Aug-13 6:45am

yeah i know..

Mohan Gopi 22-Aug-13 6:47am

Use this code ..

List NameList = (from r in dt.AsEnumerable()
select r.Field("ColumnName1") + r.Field("ColumnName2")).ToList();

Let me know..

rahul55555 22-Aug-13 6:57am

List<string> Namelist = (from dr in dt.AsEnumerable() select dr.Field("Tran_DateTime") + dr.Field("Tran_UniqueNum")).ToList();

please check what is the error in this..

Mohan Gopi 22-Aug-13 6:59am

Here the field datatype tag is not taking, so i will add my solution in below yar.. kindly check it.

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Mohan Gopi · Answer 1 · 2013-08-22T01:05:00

Solution 2

Hi Rahul, try this

C#

List<string> NameList = (from r in dt.AsEnumerable()
select r.Field<Column1DataType>("Column1") + r.Field<Column2DataType>("Column2")).ToList();

i hope this will help you...

Posted 22-Aug-13 1:05am

Mohan Gopi

CodeBlack · Answer 2 · 2013-08-21T22:46:00

Solution 1

Use Below Code :

C#

List<string> fields = new List<string>();

for (int column = 0; column < dt.Columns.Count; column++)
{
  for (int row = 0; row < dt.Rows.Count; row++)
  {
    fields.Add(dt.Rows[row][column].ToString());
  }
}

Posted 21-Aug-13 22:46pm

CodeBlack

Updated 21-Aug-13 22:52pm

v3

Comments

rahul55555 22-Aug-13 4:55am

sory, i am gettin data in only 1 column one after the other

CodeBlack 22-Aug-13 4:58am

ok. so you want all the columns into separate lists ? and you want to bind those lists into gridview right ? If you want to do this than you can directly assign DataTable to GridView's DataSource.

rahul55555 22-Aug-13 5:04am

yeah i can do that.. but i have 1 column in list. how to bind both datatable and list to gridview

rahul55555 22-Aug-13 5:00am

not working..
8/20/2013 10:41:41 AM
8/20/2013 10:07:29 AM
8/20/2013 10:04:57 AM
8/20/2013 9:27:42 AM
8/20/2013 10:03:33 AM
8/20/2013 12:00:00 AM
8/20/2013 12:00:00 AM
8/20/2013 12:00:00 AM
8/20/2013 12:00:00 AM
8/20/2013 12:00:00 AM
8/20/2013 12:00:00 AM
8/20/2013 12:00:00 AM
456
5648
5752
12345
24542
180063442435
180065242435
180065342435
184563442435
184563474435
524563234435
524563474435
i am gettin like this in 1 single column

CodeBlack 22-Aug-13 5:20am

i am not getting clear about your question. But if you want to bind list and datatable then if there is a mapping between those two collections then you can create a new property class (Entity Class) and then after you can assign those values to the property class.

Another option is to add new column into datatable as mentioned below :

dt.Columns.Add(new DataColumn("NewColumn"));
for (int i = 0; i < list.Count; i++)
{
if (dt.Rows.Count < i + 1)
{
DataRow dr = dt.NewRow();
dt.Rows.Add(dr);
}

dt.Rows[i]["NewColumn"] = list[i];
}