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How to Create Database component -Enterprise Application Using C# Lab

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How to Create Database component -Enterprise Application Using C# Lab

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How to Create Database component -Enterprise Application Using C# Lab

  1. 1. Studb.cs using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.Data; using System.Data.SqlClient; namespace student { public class studb { public string getId(string sqlquery, SqlConnection connectionstring, ComboBox combox1) { DataSet ds = new DataSet(); SqlDataAdapter adap = new SqlDataAdapter(sqlquery, connectionstring); adap.Fill(ds, "student"); for (int i = 0; i < ds.Tables[0].Rows.Count; i++) { combox1.Items.Add(ds.Tables[0].Rows[i][0].ToString()); } return null; } public string add(string id, string name, string dept, string phone, SqlConnection connectionstring) { string sqlquery = "insert into student(id,name,dept,phone) values ('" + id + "','" + name + "','" + dept + "','" + phone + "')"; SqlCommand cmd = new SqlCommand(sqlquery,connectionstring ); //connectionstring.Open(); try { cmd.ExecuteNonQuery(); MessageBox.Show("Inserted"); } catch (Exception e) { MessageBox.Show("not inserted"); } return null;
  2. 2. } public string showgrid(string sqlquery, SqlConnection connectionstring, DataGridView grid1) { DataSet ds = new DataSet(); SqlDataAdapter adap = new SqlDataAdapter(sqlquery, connectionstring); adap.Fill(ds, "student"); grid1.DataSource = ds; grid1.DataMember = "student"; return null; } } } ************************ Form1.cs using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using student; using System.Data.SqlClient; namespace college { public partial class Form1 : Form { SqlConnection con = new SqlConnection(); public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { con.ConnectionString = @"Data Source=(LocalDB)v11.0;AttachDbFilename=E:c#studentstudentCollege.mdf;Integrated Security=True";
  3. 3. con.Open(); string sqlquery = "select id from student"; studb st = new studb(); st.getId(sqlquery, con, comboBox1); } private void label1_Click(object sender, EventArgs e) { } private void button2_Click(object sender, EventArgs e) { string sqlquery = "Select * from student where id='"+comboBox1.Text +"'"; studb st = new studb(); st.showgrid(sqlquery, con, dataGridView1); } private void button1_Click(object sender, EventArgs e) { studb st = new studb(); st.add(textBox1.Text, textBox2.Text, textBox3.Text,textBox4.Text, con); } private void Exit_Click(object sender, EventArgs e) { this.Close(); } } }

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