Data column Overloads
ColumnName = "ID",
DataType = typeof(int),
AutoIncrement = true,
AutoIncrementSeed = 1,
AutoIncrementStep = 1,
dt.Columns.Add("ProductName");
dt.Columns.Add("Quantity", typeof(Int16));
dt.Columns["Total"].Expression = "UnitPrice*Quantity";
OR
dt.Columns.Add("Total", typeof(Double), "UnitPrice*Quantity" );
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