How to Add columns in a DataTable in c#?

How to Add columns in a DataTable in c#?

You create DataColumn objects within a table by using the DataColumn constructor, or by calling the Add method of the Columns property of the table, which is a DataColumnCollection. The Add method accepts optional ColumnName, DataType, and Expression arguments and creates a new DataColumn as a member of the collection.

Can we convert DataTable to list in C#?

There are the following 3 ways to convert a DataTable to a List. Using a Loop. Using LINQ. Using a Generic Method.

How do I bind a DataSet to a list in C#?

private static DataTable Table(string name, IEnumerable list, PropertyInfo[] pi) { DataTable table = new DataTable(name);…Use

  1. var list = new List();
  2. list. Add(new Person { ID = 1, Name = “Arunava” });
  3. list. Add(new Person { ID = 2, Name = “Bubu” });
  4. DataSet converted = list. ConvertToDataSet(“TestTable”);

How do I copy a column from one DataTable to another in C#?

The simplest way is to clone an existing DataTable, loop through all rows of source DataTable and copy data from column by column and add row to the destination DataTable. The following code does the same: For Each dr As DataRow In sourceTable. Rows.

What is SetOrdinal in C#?

Changes the ordinal or position of the DataColumn to the specified ordinal or position. public: void SetOrdinal(int ordinal); C# Copy.

How do I copy from one DataTable to another?

Copy() creates a new DataTable with the same structure and data as the original DataTable. To copy the structure to a new DataTable, but not the data, use Clone().

What is CopyToDataTable C#?

CopyToDataTable(IEnumerable) Returns a DataTable that contains copies of the DataRow objects, given an input IEnumerable object where the generic parameter T is DataRow.

What is the difference between SqlDataReader and SQlDataAdapter?

A SqlDataAdapter is typically used to fill a DataSet or DataTable and so you will have access to the data after your connection has been closed (disconnected access). The SqlDataReader is a fast forward-only and connected cursor which tends to be generally quicker than filling a DataSet/DataTable.

Can we return two list in C#?

This isn’t a nice way of doing it unless you don’t know the amount of lists or if it is more than 2-3 lists. public static (Listlist1, List list2) Method2(int[] array, int number) { return (new List(), new List()); } var (l1, l2) = Method2(arr,num);

What is the use of AsEnumerable in C#?

AsEnumerable() in C# To cast a specific type to its IEnumerable equivalent, use the AsEnumerable() method. It is an extension method. int[] arr = new int[5]; arr[0] = 10; arr[1] = 20; arr[2] = 30; arr[3] = 40; arr[4] = 50; Now, get the IEnumerable equivalent.