How to add New Column with Value to the Existing DataTable?

Without For loop:

Dim newColumn As New Data.DataColumn("Foo", GetType(System.String))     newColumn.DefaultValue = "Your DropDownList value" table.Columns.Add(newColumn) 

C#:

System.Data.DataColumn newColumn = new System.Data.DataColumn("Foo", typeof(System.String));newColumn.DefaultValue = "Your DropDownList value";table.Columns.Add(newColumn);

Add the column and update all rows in the DataTable, for example:

DataTable tbl = new DataTable();tbl.Columns.Add(new DataColumn("ID", typeof(Int32)));tbl.Columns.Add(new DataColumn("Name", typeof(string)));for (Int32 i = 1; i <= 10; i++) {    DataRow row = tbl.NewRow();    row["ID"] = i;    row["Name"] = i + ". row";    tbl.Rows.Add(row);}DataColumn newCol = new DataColumn("NewColumn", typeof(string));newCol.AllowDBNull = true;tbl.Columns.Add(newCol);foreach (DataRow row in tbl.Rows) {    row["NewColumn"] = "You DropDownList value";}//if you don't want to allow null-values'newCol.AllowDBNull = false;

//Data Table protected DataTable tblDynamic        {            get            {                return (DataTable)ViewState["tblDynamic"];            }            set            {                ViewState["tblDynamic"] = value;            }        }//DynamicReport_GetUserType() function for getting data from DBSystem.Data.DataSet ds = manage.DynamicReport_GetUserType();                tblDynamic = ds.Tables[13];//Add Column as "TypeName"                tblDynamic.Columns.Add(new DataColumn("TypeName", typeof(string)));//fill column data against ds.Tables[13]                for (int i = 0; i < tblDynamic.Rows.Count; i++)                {                    if (tblDynamic.Rows[i]["Type"].ToString()=="A")                    {                        tblDynamic.Rows[i]["TypeName"] = "Apple";                    }                    if (tblDynamic.Rows[i]["Type"].ToString() == "B")                    {                        tblDynamic.Rows[i]["TypeName"] = "Ball";                    }                    if (tblDynamic.Rows[i]["Type"].ToString() == "C")                    {                        tblDynamic.Rows[i]["TypeName"] = "Cat";                    }                    if (tblDynamic.Rows[i]["Type"].ToString() == "D")                    {                        tblDynamic.Rows[i]["TypeName"] = "Dog;                    }                }