How can I add a new column and data to a datatable that already contains data?
How do I add a new DataColumn
to a DataTable
object that already contains data?
PseudoCode
//call SQL helper class to get initial data
DataTable dt = sql.ExecuteDataTable("sp_MyProc");
dt.Columns.Add("NewColumn", type(System.Int32));
foreach(DataRow row in dr.Rows)
{
//need to set value to NewColumn column
}
Just keep going with your code - you're on the right track:
//call SQL helper class to get initial data
DataTable dt = sql.ExecuteDataTable("sp_MyProc");
dt.Columns.Add("NewColumn", typeof(System.Int32));
foreach(DataRow row in dt.Rows)
{
//need to set value to NewColumn column
row["NewColumn"] = 0; // or set it to some other value
}
// possibly save your Dataset here, after setting all the new values
Should it not be foreach
instead of for!?
//call SQL helper class to get initial data
DataTable dt = sql.ExecuteDataTable("sp_MyProc");
dt.Columns.Add("MyRow", **typeof**(System.Int32));
foreach(DataRow dr in dt.Rows)
{
//need to set value to MyRow column
dr["MyRow"] = 0; // or set it to some other value
}
Here is an alternate solution to reduce For/ForEach looping, this would reduce looping time and updates quickly :)
dt.Columns.Add("MyRow", typeof(System.Int32));
dt.Columns["MyRow"].Expression = "'0'";
Only you want to set default value parameter. This calling third overloading method.
dt.Columns.Add("MyRow", type(System.Int32),0);
Try this
> dt.columns.Add("ColumnName", typeof(Give the type you want));
> dt.Rows[give the row no like or or any no]["Column name in which you want to add data"] = Value;