How to show confirm message while deleting grid view row.

Introduction:

In my previous article I have explained about Code used to How to generate random strings/passwords using c#.net. In this article I am going to explain about how to show the confirmation message while deleting the row from the grid view using c#.net.

Explanation:

For the explanation purpose I have created table with cities named tempCities and created two procedures one for inserting and another one for deleting.

Below is the script used.

CREATE TABLE tempCities(Id int identity,Cityname Varchar(50))

GO

INSERT INTO tempCities VALUES('Chennai')

INSERT INTO tempCities VALUES('Bangalore')

INSERT INTO tempCities VALUES('Delhi')

INSERT INTO tempCities VALUES('Kolkatta')

INSERT INTO tempCities VALUES('Mumbai')

GO

CREATE PROC getTempCities

AS

BEGIN

            SET NOCOUNT ON

            SELECT Id,Cityname FROM TempCities

            SET NOCOUNT OFF

END

GO

CREATE PROC deleteTempCities(@Id INT)

AS

BEGIN

            SET NOCOUNT ON

            DELETE FROM TempCities WHERE ID=@Id

            SET NOCOUNT OFF

END

GO

Then I have a grid view control in my page which will show the city details

If you try to delete the row then it will ask for the confirmation like below

Below is the aspx code used

<form id="form1" runat="server">

<div>

    <asp:GridView DataKeyNames="Id" ID="grdResults" runat="server" AutoGenerateColumns="false">

        <Columns>

            <asp:BoundField DataField="Id" HeaderText="ID" />

            <asp:BoundField DataField="Cityname" HeaderText="City Name" />

            <asp:TemplateField HeaderText="Action">

                <ItemTemplate>

                    <asp:LinkButton ID="lbDelete" runat="server" OnClick="lbDelete_Click" OnClientClick="return fnConfirm();"> Delete</asp:LinkButton>

                </ItemTemplate>

            </asp:TemplateField>

        </Columns>

    </asp:GridView>

</div>

</form>

<script type="text/javascript">

    function fnConfirm() {

        if (confirm("The item will be deleted. Are you sure want to continue?") == true)

            return true;

        else

            return false;

    }

</script>

Below is the aspx.cs code used

using System;

using System.Collections.Generic;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page

{

    string sqlConnStr = "Data Source=.;Initial Catalog=mydb;Persist Security Info=True;User ID=sa;password=password;";

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            BindData();

        }

    }

    private void BindData()

    {

        DataSet ds = new DataSet();

        using (SqlConnection sqlConn = new SqlConnection(sqlConnStr))

        {

            using (SqlCommand sqlCmd = new SqlCommand())

            {

                sqlCmd.Connection = sqlConn;

                sqlCmd.CommandType = CommandType.StoredProcedure;

                sqlCmd.CommandText = "getTempCities";

                using (SqlDataAdapter sqlAdp = new SqlDataAdapter(sqlCmd))

                {

                    sqlAdp.Fill(ds);

                }

            }

        }

        grdResults.DataSource = ds;

        grdResults.DataBind();

    }

    protected void lbDelete_Click(object sender, EventArgs e)

    {

        LinkButton lnkbtn = sender as LinkButton;

        GridViewRow grdRow = lnkbtn.NamingContainer as GridViewRow;

        string Cityid = grdResults.DataKeys[grdRow.RowIndex].Value.ToString();

        using (SqlConnection sqlConn = new SqlConnection(sqlConnStr))

        {

            using (SqlCommand sqlCmd = new SqlCommand())

            {

                if (sqlConn.State == ConnectionState.Closed)

                    sqlConn.Open();

                sqlCmd.Connection = sqlConn;

                sqlCmd.CommandType = CommandType.StoredProcedure;

                sqlCmd.Parameters.AddWithValue("@Id", Cityid);

                sqlCmd.CommandText = "deleteTempCities";

                sqlCmd.ExecuteNonQuery();

                sqlConn.Close();

            }

        }

        BindData();

    }

}

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