运行后，每次增加的列名都是10-31，而不是10-1，……10-31
页面代码
[code=C#]
        protected void Page_Load(object sender, EventArgs e)
        {
            int ddays = Convert.ToInt32(DateTime.DaysInMonth(DateTime.Now.Year, DateTime.Now.Month))//获取本月的天数;
            if (!IsPostBack)
            {
                TemplateField customField = new TemplateField();
                customField.ShowHeader = true;
                for (int i = 1; i <= ddays; i++)
                {
                    string datetime = DateTime.Now.Month + "-" + i;
                    customField.HeaderTemplate = new MyTemplate(datetime, DataControlRowType.Header);
                    customField.ItemTemplate = new MyTemplate("", DataControlRowType.DataRow);
                    GridView1.Columns.Add(customField);
                }
                GridView1.DataSource = CreateDataSource();
                GridView1.DataBind();
            }


        }

        ICollection CreateDataSource()
        {
            DataTable dt = new DataTable();
            DataRow dr;
            dt.Columns.Add(new DataColumn("id", typeof(Int32)));
            dt.Columns.Add(new DataColumn("text", typeof(string)));
            for (int i = 0; i < 6; i++)
            {
                dr = dt.NewRow();
                dr[0] = i;
                dr[1] = "列表项目 " + i.ToString();
                dt.Rows.Add(dr);
            }
            DataView dv = new DataView(dt);
            return dv;
        }

[/code]

接口：
[code=C#]
public class MyTemplate:ITemplate
    {
        #region ITemplate 成员

        private string strColumnName; //列名字
        private DataControlRowType dcrtColumnType; //数据行功能
        public MyTemplate(string strColumnName,DataControlRowType dcrtColumnType)
        {
            this.strColumnName = strColumnName;
            this.dcrtColumnType = dcrtColumnType;
        }

        public void InstantiateIn(Control container)
        {
            switch(dcrtColumnType)
            {
                case DataControlRowType.Header:
                    Literal ltr = new Literal();
                    ltr.Text = strColumnName;
                    container.Controls.Add(ltr);
                    break;
                case DataControlRowType.DataRow:
                    Label labe = new Label();
                    labe.ID = "lab1";
                    labe.Text = "";
                    container.Controls.Add(labe);
                    //DropDownList drr = new DropDownList();
                    //drr.ID = "dropdown";
                    //drr.AppendDataBoundItems = true;
                    //drr.Items.Add(new ListItem("-----请选择------", ""));
                    //drr.Items.Add(new ListItem("AA", "a"));
                    //drr.Items.Add(new ListItem("BB", "b"));
                    //drr.Items.Add(new ListItem("CC", "c"));
                    //container.Controls.Add(drr);
                    break;
            }
        }

        #endregion
    }
[/code]