用编码实现gridview的创建！（一）（转www.asp.net）

完全用编码实现gridview创建和clounms的添加。
原理大概是三部分：
datasource对象的设置和gridview对象的设置和Columns的添加。看完后感觉不难，但是人家的思路的确值得我们推敲。
这是第一部分，等第二部分出来了，马上更新。

protected void Page_Load(object sender, EventArgs e)
{
SqlDataSource1.ConnectionString =
@"data source=.;initial catalog=northwind;integrated security=true";
SqlDataSource1.SelectCommand =
"select employeeID,FirstName,LastName from employees";
SqlDataSource1.UpdateCommand =
"update employees set firstname=@FirstName,lastname=@LastName where employeeid=@EmployeeID";
SqlDataSource1.UpdateParameters.Add("@FirstName", "");
SqlDataSource1.UpdateParameters.Add("@LastName", "");
SqlDataSource1.UpdateParameters.Add("@EmployeeID", "");
if (!IsPostBack)
{
GridView1.DataSourceID = "SqlDataSource1";
GridView1.AutoGenerateColumns = false;
GridView1.DataKeyNames = new string[] { "EmployeeID" };
GridView1.AllowPaging = true;
GridView1.AllowSorting = true;
GridView1.PageSize = 5;
BoundField bf1 = new BoundField();
BoundField bf2 = new BoundField();
BoundField bf3 = new BoundField();
bf1.HeaderText = "Employee ID";
bf1.DataField = "EmployeeID";
bf1.ReadOnly = true;
bf1.SortExpression = "EmployeeID";
bf2.HeaderText = "First Name";
bf2.DataField = "FirstName";
bf2.SortExpression = "FirstName";
bf3.HeaderText = "Last Name";
bf3.DataField = "LastName";
bf3.SortExpression = "LastName";
CommandField cf = new CommandField();
cf.ButtonType = ButtonType.Button;
cf.ShowCancelButton = true;
cf.ShowEditButton = true;
GridView1.Columns.Add(bf1);
GridView1.Columns.Add(bf2);
GridView1.Columns.Add(bf3);
GridView1.Columns.Add(cf);
}
}