Delete record from database in ASP.Net

Hi Joey,

Please refer the below code.

Database

CREATE TABLE [Vegetables](
	[ID] [int] IDENTITY(1,1) NOT NULL,
	[Name] [varchar](50) NULL,
	[PricePerKg] [varchar](50) NULL,
	[Quantity] [int] NULL,
 CONSTRAINT [PK_Vegetables] PRIMARY KEY CLUSTERED 
(
	[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

HTML

        <asp:GridView ID="gvVegetables" runat="server" AutoGenerateColumns="false" OnSelectedIndexChanged="OnSelectedIndexChanged">
            <Columns>
                <asp:BoundField DataField="Id" HeaderText="Id" />
                <asp:BoundField DataField="Name" HeaderText="Name" />
                <asp:BoundField DataField="PricePerKg" HeaderText="PricePerkg" />
                <asp:ButtonField Text="Select" CommandName="Select" />
            </Columns>
        </asp:GridView>
        <br />
        <table>
            <tr>
                <td>Id:</td>
                <td>
                    <asp:Label ID="lblId" runat="server"></asp:Label></td>
            </tr>
            <tr>
                <td></td>
                <td>
                    <asp:Button Text="Delete" runat="server" OnClick="OnDelete" /></td>
            </tr>
        </table>

Namespace

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

Code

#region Events

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.BindGrid();
    }
}

protected void OnDelete(object senedr, EventArgs e)
{
    int id= Int32.Parse(lblId.Text);
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection sqlConnection = new SqlConnection(constr))
    {
        using (SqlCommand sqlCommand = new SqlCommand("DELETE Vegetables WHERE Id = @Id ", sqlConnection))
        {
            sqlCommand.Parameters.AddWithValue("@Id", id);
            sqlConnection.Open();
            sqlCommand.ExecuteNonQuery();
            sqlConnection.Close();
        }
    }
    this.BindGrid();
}

protected void OnSelectedIndexChanged(object sender, EventArgs e)
{
    int id = int.Parse(gvVegetables.SelectedRow.Cells[0].Text);
    lblId.Text = id.ToString();      
}

#endregion

#region Private Methods

private void BindGrid()
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection sqlConnection = new SqlConnection(constr))
    {
        using (SqlCommand sqlCommand = new SqlCommand("SELECT TOP 20 Id, Name, PricePerKg FROM Vegetables", sqlConnection))
        {
            using (SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(sqlCommand))
            {
                using (DataTable dtVegetables = new DataTable())
                {
                    sqlDataAdapter.Fill(dtVegetables);
                    gvVegetables.DataSource = dtVegetables;
                    gvVegetables.DataBind();
                }
            }
        }
    }
}

#endregion

Screenshot