1. Create a new Windows Forms application.
   
   
   
   
2. Create a database (named Sample). Add a table tbl_Record. The following is the table schema for creating tbl_Record.
   
   
   
   
3. Create a form (named frmMain) and drop a Label, TextBox, Button and DataGridView control from the ToolBox.
   
    

Now, go to the frmMain.cs code and add the System.Data and System.Data.SqlClient namespaces.

 

frmMain.cs Code

1. using System;  
2. using System.Data;  
3. using System.Windows.Forms;  
4. using System.Data.SqlClient;  
5.   
6. namespace InsertUpdateDeleteDemo  
7. {  
8.     public partial class frmMain : Form  
9.     {  
10.         SqlConnection con= new SqlConnection("Data Source=.;Initial Catalog=Sample;Integrated Security=true;");  
11.         SqlCommand cmd;  
12.         SqlDataAdapter adapt;  
13.         //ID variable used in Updating and Deleting Record  
14.         int ID = 0;  
15.         public frmMain()  
16.         {  
17.             InitializeComponent();  
18.             DisplayData();  
19.         }  
20.         //Insert Data  
21.         private void btn_Insert_Click(object sender, EventArgs e)  
22.         {  
23.             if (txt_Name.Text != "" && txt_State.Text != "")  
24.             {  
25.                 cmd = new SqlCommand("insert into tbl_Record(Name,State) values(@name,@state)", con);  
26.                 con.Open();  
27.                 cmd.Parameters.AddWithValue("@name", txt_Name.Text);  
28.                 cmd.Parameters.AddWithValue("@state", txt_State.Text);  
29.                 cmd.ExecuteNonQuery();  
30.                 con.Close();  
31.                 MessageBox.Show("Record Inserted Successfully");  
32.                 DisplayData();  
33.                 ClearData();  
34.             }  
35.             else  
36.             {  
37.                 MessageBox.Show("Please Provide Details!");  
38.             }  
39.         }  
40.         //Display Data in DataGridView  
41.         private void DisplayData()  
42.         {  
43.             con.Open();  
44.             DataTable dt=new DataTable();  
45.             adapt=new SqlDataAdapter("select * from tbl_Record",con);  
46.             adapt.Fill(dt);  
47.             dataGridView1.DataSource = dt;  
48.             con.Close();  
49.         }  
50.         //Clear Data  
51.         private void ClearData()  
52.         {  
53.             txt_Name.Text = "";  
54.             txt_State.Text = "";  
55.             ID = 0;  
56.         }  
57.         //dataGridView1 RowHeaderMouseClick Event  
58.         private void dataGridView1_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)  
59.         {  
60.             ID = Convert.ToInt32(dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString());  
61.             txt_Name.Text = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();  
62.             txt_State.Text = dataGridView1.Rows[e.RowIndex].Cells[2].Value.ToString();  
63.         }  
64.         //Update Record  
65.         private void btn_Update_Click(object sender, EventArgs e)  
66.         {  
67.             if (txt_Name.Text != "" && txt_State.Text != "")  
68.             {  
69.                 cmd = new SqlCommand("update tbl_Record set Name=@name,State=@state where ID=@id", con);  
70.                 con.Open();  
71.                 cmd.Parameters.AddWithValue("@id", ID);  
72.                 cmd.Parameters.AddWithValue("@name", txt_Name.Text);  
73.                 cmd.Parameters.AddWithValue("@state", txt_State.Text);  
74.                 cmd.ExecuteNonQuery();  
75.                 MessageBox.Show("Record Updated Successfully");  
76.                 con.Close();  
77.                 DisplayData();  
78.                 ClearData();  
79.             }  
80.             else  
81.             {  
82.                 MessageBox.Show("Please Select Record to Update");  
83.             }  
84.         }  
85.         //Delete Record  
86.         private void btn_Delete_Click(object sender, EventArgs e)  
87.         {  
88.             if(ID!=0)  
89.             {  
90.                 cmd = new SqlCommand("delete tbl_Record where ID=@id",con);  
91.                 con.Open();  
92.                 cmd.Parameters.AddWithValue("@id",ID);  
93.                 cmd.ExecuteNonQuery();  
94.                 con.Close();  
95.                 MessageBox.Show("Record Deleted Successfully!");  
96.                 DisplayData();  
97.                 ClearData();  
98.             }  
99.             else  
100.             {  
101.                 MessageBox.Show("Please Select Record to Delete");  
102.             }  
103.         }  
104.     }  
105. }  

In the preceding code, I created a dataGridView1_RowHeaderMouseClick Event for updating and deleting the selected record. When the user clicks on the Row Header of a row then the data present in the cell of the row is stored into the TextBoxes. The DisplayData() method fills in the data in the DataGridView.

 

The Clear() method clears the data present in the TextBox as well as in the ID(int) variable.