DataTable already belongs to another DataSet & DataRow already belongs to another DataRow.

Error: DataTable already belongs to another DataSet

Try in this way to copy data table from data set to another data set.

DataSet ds = new DataSet();

ds = GetDataSet();

ds.Tables[0].TableName = "Old";

DataSet dsNew = new DataSet();

DataTable dt = ds.Tables[0];

ds.Tables.Remove(dt);

dt.TableName = "New";

dsNew.Tables.Add(dt);

Error : DataRow already belongs to another DataRow.

Copy data Row from one data table to another data table

DataTable dt = new DataTable();

Use ImportRow Instead of Row.Add (dt.Rows.Add(dataRow);)

dt.ImportRow(dataRow);

Get Updated Row state

This GetChanges method will give the updated row from original dataset.
And RowState method will give the state “Updated”,“Deleted”,”Inserted”

dsDataSet.GetChanges()
dsDataSet.Table[0].GetChages()
string updateMode = dsDataSet.Tables[0].Rows[rowNumber].RowState.ToString();

Create DataSet from DataRow.

private DataSet GetFilterChildRecords(DataSet dsMainDataSet,string whereCondition)

{

try

{

DataRow[] dr = dsMainDataSet.Tables[1].Select(whereCondition);

dsSetActCode_Details = dsMainDataSet.Clone();

for (int i = 0 ;i<dr.Length ;i++)

{

DataRow drNew = dsSetActCode_Details.Tables[1].NewRow();

dsSetActCode_Details.Tables[1].Rows.Add(drNew);

for (int j = 0; j < dr[i].ItemArray.Length; j++)

{

dsSetActCode_Details.Tables[1].Rows[i][j] = dr[i][j];

}

}

return dsSetActCode_Details;

}

catch(Exception Ex)

{

throw Ex;}

}