database1.mdf内容结构如下：
id char(10) primary key
username char(10)
userpass char(10)
内容：
id username userpass
1 1 1
2 2 2
database2.mdf内容结构如下：
id char(10) primary key
username char(10)
userpass char(10)
内容为空数据库
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Data.OleDb;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string Conn = @"Data Source=.\SQLEXPRESS;AttachDbFilename='C:\Users\lenovo\AppData\Local\Temporary Projects\WindowsFormsApplication1\Database1.mdf';Integrated Security=True;User Instance=True";
SqlConnection conn = new SqlConnection(Conn);
string sSql = "select * from Table1";
SqlDataAdapter da = new SqlDataAdapter(sSql, conn);
DataSet ds = new DataSet();
da.Fill(ds);
//MessageBox.Show(ds.Tables[0].Rows[1][2].ToString());
for (int i = 0; i < ds.Tables[0].Rows.Count; i++) {
fun(ds.Tables[0].Rows[i][0].ToString(), ds.Tables[0].Rows[i][1].ToString(), ds.Tables[0].Rows[i][2].ToString());
}
dataGridView1.DataSource = ds.Tables[0];
}
public void fun(string s1, string s2, string s3)
{
SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename='C:\Users\lenovo\AppData\Local\Temporary Projects\WindowsFormsApplication1\Database2.mdf';Integrated Security=True;User Instance=True");
StringBuilder strSQL = new StringBuilder();//创建StringBuilder对象
strSQL.Append("insert into Table2 values('"+s1+"','"+s2+"','"+s3+"')");
using (SqlCommand cmd =//创建数据库命令对象
new SqlCommand(strSQL.ToString(), con))
{
con.Open();//打开数据库连接
cmd.ExecuteNonQuery();//执行SQL命令
MessageBox.Show("添加数据成功");//弹出消息对话框
con.Close();//关闭数据库连接
}
}
}
}