连接sql server数据库

//连接数据库
string sqlStr = "Server=(local);User Id=sa;Pwd=;DataBase=pubs";
SqlConnection con = new SqlConnection(sqlStr);
conn.Open();
//数据库相关操作

//关闭数据库
conn.Close();

在Web.config 文件来配置连接数据库的字符串

<configuration>
<appSettings>
  <add key="ConnectionString" value="server=TIE\SQLEXPRESS;database=db_09;Uid=sa;password="""/>
</appSetting>
<connectionString/>

在Default.aspx 页中，使用ConfigurationManager类获取配置节点的连接字符串

public SqlConnection getConnection
{
  string mySqlString = ConfigurationManager.AppSetting["ConnectionString"].ToString();
  SqlConnection myConn = new SqlConnection(mySqlString);
  return myConn;
}

在Default.aspx页中编写查询的代码

protected void btnSelect_Click(object sender, EvetArgs e)
{
  if(this.txtname.Text != "")
  {
    SqlConnection myConn = GetConnection();
    myConn.Open();
    //使用Command对象查询数据库中的记录
    string sqlStr = "select * from tb_Student where Name=@Name";
    SqlCommand myCmd = new SqlCommand(sqlStr,myConn);
    myCmd.Parameters.Add("@Name",SqlDbType.VarChar,20).Value = this.txtName.Text.Trim();
    SqlDataAdapter myDa = new SqlDataAdapter(myCmd);
    DataSet myDs = new DataSet();
    myDa.Fill(myDs);
    if(myDs.Tables[0].Rows.count > 0)
    {
        GridView1.DataSource = myDs;
        GridView1.DataBind();
    }
    else
    {
        Response.Write("<script>alert('没有相关的记录')</script>");
    }
    myDa.Dispose();
    myDs.Dispose();
    myConn.Close();
  }else
  {
    this.bind();
  }
}

插入记录

protected void btnAdd_Click(object sender, EventArgs e){
    if(this.txtClass.Text != "")
    {
        SqlConnection myConn = getConnection;
        myConn.Open();
        string sqlStr = "insert into tb_Class(ClassName) values(" + this.txtClass.Text.Trim() + "")";
        SqlCommand myCmd = new SqlCommand(sqlStr,myConn);
        myCmd.ExecuteNonQuery();
        myCmd.Close();
        this.bind();
    }else{
        this.bind();
    }
}

使用Command对象操作数据

使用Command对象查询数据

参考资料
ASP.NET 从入门到精通