怎么样才能在删除数据库中表的列同时也删除服务器内存中DataTable中相应的列

Question

VS关了，写点伪代码吧
伪代码 public DataTable FetchEndDelete(int rowID)
{
 string sqlstr=string.Format(@"delete table1 where id='{0}' select * From table1",rowID);
 SqlConnection conn=new SqlConnection(connectString);
 SqlCommand cmd=new SqlCommand(sqlstr);
 cmd.Connection=conn;
 SqlDataAdapter ada=new SqlDataAdapter(cmd);
 DataTable dt=new DataTable();
 ada.Fill(dt);
 conn.Close();
 cmd.Dispose();
 return dt;} 

Answer 1

alter table table1 drop column id
dt.Rows.RemoveAt(index);
删除后重新绑定数据或删除

Answer 2

删除数据后
重新select * from table
重新绑定

Answer 3

你可以使用sqlhelper,本文没用。代码如下：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;public partial class _Default : System.Web.UI.Page 
{//清清月儿http://blog.csdn.net/21aspnet 
    SqlConnection sqlcon;
    SqlCommand sqlcom;
    string strCon = "Data Source=(local);Database=数据库名;Uid=帐号;Pwd=密码";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            bind();
        }
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        bind();
    }//删除
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string sqlstr = "delete from 表 where id='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
        sqlcon = new SqlConnection(strCon);
        sqlcom = new SqlCommand(sqlstr,sqlcon);
        sqlcon.Open();
        sqlcom.ExecuteNonQuery();
        sqlcon.Close();
        bind();
    }//更新
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        sqlcon = new SqlConnection(strCon);
        string sqlstr = "update 表 set 字段1='"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim() + "',字段2='"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[2].Controls[0])).Text.ToString().Trim() + "',字段3='"
            + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "' where id='" 
            + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
        sqlcom=new SqlCommand(sqlstr,sqlcon);
        sqlcon.Open();
        sqlcom.ExecuteNonQuery();
        sqlcon.Close();
        GridView1.EditIndex = -1;
        bind();
    }//取消
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView1.EditIndex = -1;
        bind();
    }//绑定
    public void bind()
    {
        string sqlstr = "select * from 表";
        sqlcon = new SqlConnection(strCon);
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds, "表");
        GridView1.DataSource = myds;
        GridView1.DataKeyNames = new string[] { "id" };//主键
        GridView1.DataBind();
        sqlcon.Close();
    }
}

Answer 4

table.GetChanges(DataRowState.Deleted)