Develop Reference

DataTable.Clear() method affect detached row

I'm trying to do something like this to create copy of a typed datarow:
var desRow = dataTable.NewRow();
var sourceRow = dataTable.Rows[rowNum];
desRow.ItemArray = sourceRow.ItemArray.Clone() as object[];
But when I call dataTable.Clear() method it clears all fields in desRow. How to create a deep copy of a DataRow?

In your code when you create your new row you create with that row a reference to the dataTable and that is why it clears all fields.
You can work with a data table clone, that way you will have a deep copy.
DataTable dt = ...
DataTable cloneDt = dt.Clone();
DataRow row = cloneDt.Rows[number];
dt.Rows.Clear();
dt.Rows.Add(row);
This way you will have your original data table with only the selected row.

How do I copy a DataColumn from DataTable1 into DataTable2?

I would copy a DataColumn from a DataTable into a another DataTable, but I don't know how to do...
DataColumn[] dc = new DataColumn[DataTable1.Columns.Count];
DataTable1.Columns.CopyTo(dc, 0);
DataTable2.Columns.Add(dc[index]);
Error
DataColumn belongs to another DataTable!

You could use the DataView.ToTable method that accepts the column names that you want to have in your new table.
DataTable DataTable2 = DataTable1.DefaultView.ToTable(false, new string[] {"CustomerName"});
Keep in mind that this creates a new DataTable from your original table with only the column specified in the string array (of course the original table should have a column named "CustomerName")

Ok, now! Removing the columns was a realy bad idea!
Much better for the columns in a DataTable:
DataGrid2.Columns[index].Visibility = System.Windows.Visibility.Collapsed;
DataGrid2.Columns[index].Visibility = System.Windows.Visibility.Visible;
And for the rows in an DataTable:
DataRow dataRow = DataTable2.NewRow();
object o = DataTable1.Rows[index].ItemArray.GetValue(index);
dataRow.SetField(index, o);
DataTable2.Rows.InsertAt(dataRow, 0);
((DataRowView)(DataGrid2.Items[index])).Row.Delete();
Thanks!

Selecting specific columns from a dataTable and copy it to another DataTable

I have a DataTable Dt1 and another DataTable Dt2.
Dt1 contains many columns and rows and Dt2 is basically empty
I know I should use Dt1.Select to select the specific DataTaRow [] but how can I copy them to Dt2
DataRow [] row = Dt1.Select("ID,MIN_VALUE,MAX_VALUE");
how can i copy them to Dt2?

For .Net Framework 3.5+
You can use CopyToDataTable method.
Returns a DataTable that contains copies of the DataRow objects, given
an input IEnumerable object.
DataTable dt1 = new DataTable();
DataRow[] dr = dt.Select("Your string");
DataTable dt2 = dr.CopyToDataTable();

Adding data to a row in a Dataset?

I am trying to add data to a row in a dataset but the data is always on a new row?
I need the data to populate under its column. I need something like Ds.Tables[0].Rows[1].add("Item")
This is how i am inserting the data:
DataSet ds = new DataSet();
ds.Tables.Add("Properties");
//GPS
ds.Tables[0].Columns.Add(ArrayProperties[0].FormMobiField);
ds.Tables[0].Rows.Add(ArrayProperties[0].Value);
//Street Num and Name
ds.Tables[0].Columns.Add(ArrayProperties[3].FormMobiField);
ds.Tables[0].Rows.Add(ArrayProperties[3].Value);
//Suburb
ds.Tables[0].Columns.Add(ArrayProperties[6].FormMobiField);
ds.Tables[0].Rows.Add(ArrayProperties[6].Value);
//City
ds.Tables[0].Columns.Add(ArrayProperties[7].FormMobiField);
ds.Tables[0].Rows.Add(ArrayProperties[7].Value);
//Province
ds.Tables[0].Columns.Add(ArrayProperties[8].FormMobiField);
ds.Tables[0].Rows.Add(ArrayProperties[8].Value);
//Locality Map
ds.Tables[0].Columns.Add(ArrayProperties[9].FormMobiField);
ds.Tables[0].Rows.Add(ArrayProperties[9].Value);
//Property Type
ds.Tables[0].Columns.Add(ArrayProperties[10].FormMobiField);
ds.Tables[0].Rows.Add(ArrayProperties[10].Value);

Just get a new Row from the DataTable and then add that row to the table, Use DataTable.NewRow method
DataRow dr = ds.Tables[0].NewRow();
dr["Column1"] = "value";
dr["Column2"] = "value";
dr["Column3"] = "value";
ds.Tables[0].Rows.Add(dr);
You are adding row after adding each column, You may first create your data table's structure by adding all the columns and then you can get the new row using DataTable.NewRow() and later you can add that row to your data table. After adding all the columns you may also try:
ds.Tables[0].Rows.Add(ArrayProperties[0].Value,ArrayProperties[1].Value,ArrayProperties[2].Value,ArrayProperties[3].Value);

The columns collection of a Datatable regards the table structure. In your code you mix adding columns and populating fileds.
You should first create the structure (not tested and syntax errors can occur):
Dataset ds = new Dataset();
Datatable dt = new Datatable();
dt.columns.add(new Column.add(...));
...
dt.columns.add(new Column.add(...));
ds.Tables.add(dt);
And then:
Datarow r = ds.tables[0].NewRow();
r["column1"] = value1;
...
r["columnX"] = valueX;
ds.Tables[0].rows.add(r);
See this msdn article for more details.

Add the columns as you are adding. For populating rows, do the below.
foreach (DataRow row in ds.Tables[0]) // Loop over the rows.
{
row[ArrayProperties[i].FormMobiField]=ArrayProperties[0].Value;
i++;
}
If it doesn't work then let me know,

asp.net copying row from one datatable to another

i have a datable and like this i have searched a datarow from the datable on the basis of some primary now i want to add that searched row to another datatable how can i achieve this please let me know
DataTable findRows = (DataTable)ViewState["dt"];
List<int> selectedList=(List<int>)ViewState["selectedList"];
DataTable temp = new DataTable();
foreach (int id in selectedList)
{
DataRow dr=findRows.Rows.Find(id);
}
now i want it to add to datatable temp how can i achieve this?

First, when creating temp don't just instantiate it as a new DataTable but instead call .Clone() on findrows to create a structurally identical DataTable.
Second, use .ImportRow() on the second DataTable and pass it the row from the first DataTable that you'd like to copy. This should create an entirely new row in the second table with the same values as the row from the first table.