新建DataTable

//创建DataTable
    DataTable dt = new DataTable("NewDt");
            
    //创建自增长的ID列
    DataColumn dc = dt.Columns.Add("ID", Type.GetType("System.Int32"));
    dc.AutoIncrement = true;   //自动增加
    dc.AutoIncrementSeed = 1;  //起始为1
    dc.AutoIncrementStep = 1;  //步长为1
    dc.AllowDBNull = false;    //非空
 
    //创建其它列表
    dt.Columns.Add(new DataColumn("Name", Type.GetType("System.String")));
    dt.Columns.Add(new DataColumn("Age", Type.GetType("System.Int32")));
    dt.Columns.Add(new DataColumn("Score", Type.GetType("System.Decimal")));
    dt.Columns.Add(new DataColumn("CreateTime", Type.GetType("System.DateTime")));
 
    //创建数据
    DataRow dr = dt.NewRow();
    dr["Name"] = "张三";
    dr["Age"] = 28;
    dr["Score"] = 85.5;
    dr["CreateTime"] = DateTime.Now;
    dt.Rows.Add(dr);
 
    dr = dt.NewRow();
    dr["Name"] = "李四";
    dr["Age"] = 24;
    dr["Score"] = 72;
    dr["CreateTime"] = DateTime.Now;
    dt.Rows.Add(dr);
 
    dr = dt.NewRow();
    dr["Name"] = "王五";
    dr["Age"] = 36;
    dr["Score"] = 63.5;
    dr["CreateTime"] = DateTime.Now;
    dt.Rows.Add(dr);