以users表为例，有三个字段，自增长的编号id，int类型；名称name，nvarchar类型，密码pwd，nvarchar类型

首先在vs2005中引入using System.Data.SqlClient;命名空间

///

/// 增加

///

/// 姓名

/// 密码

///

public int Insert(string name,string pwd)

{

SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=Test;Integrated Security=True");//Initial Catalog后面跟你数据库的名字,如果你的SqlServer服务器名称后面不带SQLEXPRESS，那么Data Source=.

conn.Open();

string sql = "insert into users(name,pwd) values(@name,@pwd)";

SqlCommand cmd = new SqlCommand(sql,conn);

SqlParameter parn = new SqlParameter("@name",name);

cmd.Parameters.Add(parn);

SqlParameter parp = new SqlParameter("@pwd", pwd);

cmd.Parameters.Add(parn);

int result = cmd.ExecuteNonQuery();//result接收受影响行数，也就是说result大于0的话表示添加成功

conn.Close();

cmd.Dispose();

return result;

}

///

/// 删除

///

/// 姓名

/// 密码

///

public int Update(int id)

{

SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=Test;Integrated Security=True");//Initial Catalog后面跟你数据库的名字,如果你的SqlServer服务器名称后面不带SQLEXPRESS，那么Data Source=.

conn.Open();

string sql = "delete from users where id=@id";

SqlCommand cmd = new SqlCommand(sql, conn);

SqlParameter parn = new SqlParameter("@id", id);

cmd.Parameters.Add(parn);

int result = cmd.ExecuteNonQuery();//result接收受影响行数，也就是说result大于0的话表示删除成功

conn.Close();

cmd.Dispose();

return result;

}

///

/// 修改

///

/// 姓名

/// 密码

///

public int Insert(string name, string pwd,int id)

{

SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=Test;Integrated Security=True");//Initial Catalog后面跟你数据库的名字,如果你的SqlServer服务器名称后面不带SQLEXPRESS，那么Data Source=.

conn.Open();

string sql = "update users set name=@name,pwd=@pwd where id=@id";

SqlCommand cmd = new SqlCommand(sql, conn);

SqlParameter parn = new SqlParameter("@name", name);

cmd.Parameters.Add(parn);

SqlParameter parp = new SqlParameter("@pwd", pwd);

cmd.Parameters.Add(parn);

SqlParameter pari = new SqlParameter("@id", id);

cmd.Parameters.Add(pari);

int result = cmd.ExecuteNonQuery();//result接收受影响行数，也就是说result大于0的话表示修改成功

conn.Close();

cmd.Dispose();

return result;

}

///

/// 查询

///

///

public DataTable Select()

{

SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=Test;Integrated Security=True");//Initial Catalog后面跟你数据库的名字,如果你的SqlServer服务器名称后面不带SQLEXPRESS，那么Data Source=.

conn.Open();

string sql = "select * from users";

SqlCommand cmd = new SqlCommand(sql, conn);

SqlDataAdapter sda = new SqlDataAdapter(cmd);

DataTable dt = new DataTable();

sda.Fill(dt);

conn.Close();

cmd.Dispose();

return dt;

}

方法写好后，下面举一个查询的例子，在form窗体中拖一个DataGridView,然后在Load方法中

private void Form1_Load(object sender, EventArgs e)

{

dataGridView1.DataSource = Select();

}

这样一运行，DataGridView中就会显示数据了

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