C# 4 and .NET 4

XMl schemas: Generating Code with XsD ❘ 849
In addition, for each nullable field, there are functions to set the field to null and to check if the field is
null. The following example shows the functions for the SupplierID column:
public partial class ProductRow : global::System.Data.DataRow {
private ProductDataTable tableProduct;
[global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
[global::System.CodeDom.Compiler.GeneratedCodeAttribute(
"System.Data.Design.TypedDataSetGenerator", "4.0.0.0")]
internal ProductRow(global::System.Data.DataRowBuilder rb) :
base(rb) {
this.tableProduct = ((ProductDataTable)(this.Table));
}
[global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
[global::System.CodeDom.Compiler.GeneratedCodeAttribute(
"System.Data.Design.TypedDataSetGenerator", "4.0.0.0")]
public int ProductID {
get {
return ((int)(this[this.tableProduct.ProductIDColumn]));
}
set {
this[this.tableProduct.ProductIDColumn] = value;
}
}
// Other column accessors/mutators removed for clarity
[global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
[global::System.CodeDom.Compiler.GeneratedCodeAttribute(
"System.Data.Design.TypedDataSetGenerator", "4.0.0.0")]
public bool IsSupplierIDNull() {
return this.IsNull(this.tableProduct.SupplierIDColumn);
}
}
[global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
[global::System.CodeDom.Compiler.GeneratedCodeAttribute(
"System.Data.Design.TypedDataSetGenerator", "4.0.0.0")]
public void SetSupplierIDNull() {
this[this.tableProduct.SupplierIDColumn] = global::System.Convert.DBNull;
}
code download product.cs
The following code uses this class’s output from the XSD tool to retrieve data from the Products table and
display that data to the console:
using System;
using System.Data;
using System.Data.SqlClient;
public class XSD_DataSet
{
public static void Main()
{
string source = "server=(local);" +
" integrated security=SSPI;" +
"database=northwind";
string select = "SELECT * FROM Products";
SqlConnection conn = new SqlConnection(source);
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