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//修改
string id = txt_id.Text.Trim(); 
string username = txt_username.Text.Trim(); 
string ps = txt_ps.Text.Trim(); 
string date = txt_date.Text.Trim(); 
string conn_string ="Data Source=localhost;Initial Catalog=SQLtest;Integrated Security=True"; 
SqlConnection connection =newSqlConnection(conn_string);
SqlCommand sqcommand =newSqlCommand("UpdateInfo", connection); 
sqcommand.CommandType=CommandType.StoredProcedure;// 将命令变为存储过程的方式 
SqlParameter sp_id =newSqlParameter("ID", id); 
sqcommand.Parameters.Add(sp_id);
SqlParameter sp_username =newSqlParameter("Username", username); 
sqcommand.Parameters.Add(sp_username); 
SqlParameter sp_password =newSqlParameter("Password", ps);
sqcommand.Parameters.Add(sp_password);
SqlParameter sp_date =newSqlParameter("Date", date); 
sqcommand.Parameters.Add(sp_date); 
connection.Open(); 
int cc = sqcommand.ExecuteNonQuery();

//查询
SqlCommand sqcommand =newSqlCommand("SelectAll",connection); 
sqcommand.CommandType=CommandType.StoredProcedure;// 将命令变为存储过程的方式 
SqlDataAdapter adapter =newSqlDataAdapter(sqcommand); 
DataTable ds =newDataTable(); 
adapter.Fill(ds); 
dataGridView1.DataSource= ds;
 connection.Close();

//删除
string id = txt_id.Text.Trim(); 
string conn_string ="Data Source=localhost;Initial Catalog=SQLtest;Integrated Security=True";
SqlConnection connection =newSqlConnection(conn_string); 
SqlCommand sqcommand =newSqlCommand("DeleteInfo", connection); 
sqcommand.CommandType=CommandType.StoredProcedure;// 将命令变为存储过程的方式 
SqlParameter sp =newSqlParameter("ID", id); 
sqcommand.Parameters.Add(sp); 
connection.Open(); 
sqcommand.ExecuteNonQuery();

//添加
string id = txt_id.Text.Trim();
 string username = txt_username.Text.Trim(); 
 string ps = txt_ps.Text.Trim(); 
 string date = txt_date.Text.Trim();
  string conn_string ="Data Source=localhost;Initial Catalog=SQLtest;Integrated Security=True"; 
SqlConnection connection =newSqlConnection(conn_string); 
SqlCommand sqcommand =newSqlCommand("InsertInto", connection); 
sqcommand.CommandType=CommandType.StoredProcedure;// 将命令变为存储过程的方式 
SqlParameter sp_id =newSqlParameter("ID", id); 
sqcommand.Parameters.Add(sp_id); 
SqlParameter sp_username =newSqlParameter("Username", username); 
sqcommand.Parameters.Add(sp_username); 
SqlParameter sp_password =newSqlParameter("Password", ps); 
sqcommand.Parameters.Add(sp_password); 
SqlParameter sp_date =newSqlParameter("Date", date); 
sqcommand.Parameters.Add(sp_date); 
connection.Open(); 
int cc = sqcommand.ExecuteNonQuery();