How to Edit, Delete, Update or Cancel Record in GridView using ASP.NET

.aspx Code:

<%@ Page Language="C#" AutoEventWireup="true" Debug ="true" EnableEventValidation ="false" CodeFile="View-Record.aspx.cs" Inherits="View_Record" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

.style3

{

width: 130px;

}

</style>

</head>

<p align="right"><a href="Next-page.aspx">Home</a> <a href="View-Record.aspx">View Record</a> <a href="Search-Page.aspx">Search Record</a> <a href="First-page.aspx">Log Out</a></p>

</div>

<h1 align="center">Student Request Management System</h1>

<table align="center"><tr><td width="60%" align="left"> View Record:</td><td class="style3" width="60%" align="left">

<asp:DropDownList ID="DropDownList1" runat="server" Width="126px"

onselectedindexchanged="DropDownList1_SelectedIndexChanged">

<asp:ListItem Text="Pending"></asp:ListItem>

<asp:ListItem Text="Resolved"></asp:ListItem>

<asp:ListItem Text="All"></asp:ListItem>

</asp:DropDownList>

</td></tr>

</table>

</div>

<p align="center"><asp:Button ID="Button1" runat="server" Text="View"

onclick="Button1_Click" Height="31px" Width="52px" />

<asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="Export to Excel"

Height="31px" Width="107px" />

</p><br />

<asp:GridView ID="GridView1" runat="server" BackColor="White"

BorderColor="#999999" BorderStyle="None" BorderWidth="1px" CellPadding="3"

GridLines="Vertical" AutoGenerateColumns="false" OnRowEditing="GridView1_RowEditing"

OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowDeleting="GridView1_RowDeleting"

OnRowUpdating="GridView1_RowUpdating" AutoGenerateDeleteButton="True"

AutoGenerateEditButton="True" DataKeyNames="Roll_No">

<asp:BoundField DataField="Student_Name" HeaderText="Student_Name" />

<asp:BoundField DataField="Roll_No" HeaderText="Roll_No" />

<asp:BoundField DataField="Contact_No" HeaderText="Contact_No" />

<asp:BoundField DataField="Date" HeaderText="Date" />

<asp:BoundField DataField="Request_No" HeaderText="Request_No" />

<asp:BoundField DataField="Type_of_problem" HeaderText="Type_of_problem" />

<asp:BoundField DataField="Course" HeaderText="Course" />

<asp:BoundField DataField="Exam_Type" HeaderText="Exam_Type" />

<asp:BoundField DataField="College" HeaderText="College" />

<asp:BoundField DataField="Complaint_Status" HeaderText="Complaint_Status" />

<asp:BoundField DataField="Remarks" HeaderText="Remarks" />

<asp:CommandField ShowEditButton="true" />

<asp:CommandField ShowDeleteButton="true" />

</Columns>

</asp:GridView>

</form>

</body>

</html>

Source Code:

using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using System.Data.SqlClient;

using System.Globalization;

using System.Xml.Linq;

using System.Text;

using System.IO;

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

{

SqlConnection conn;

protected void Page_Load(object sender, EventArgs e)

{

GridView1.Visible = false;

conn = new SqlConnection("Initial Catalog=Shaily_db;Data Source=DU-PC;Integrated Security=SSPI");

if (!Page.IsPostBack)

{

GridView1.DataSource = BindData();

GridView1.DataBind();

}

else if (!IsPostBack)

{

gvbind();

}

protected void Button1_Click(object sender, EventArgs e)

{

GridView1.Visible = true;

switch (DropDownList1.SelectedIndex)

{

case 0: GridviewBind2();

break;

case 1: GridviewBind1();

break;

case 2: GridviewBind();

break;

}

public void GridviewBind()

{

SqlConnection con = new SqlConnection("Initial Catalog=Shaily_db;Data Source=DU-PC;Integrated Security=SSPI");

con.Open();

SqlCommand cmd = new SqlCommand("Select * from Student_Comp", con);

SqlDataReader dr = cmd.ExecuteReader();

GridView1.DataSource = dr;

GridView1.DataBind();

con.Close();

}

public void GridviewBind1()

{

SqlConnection con = new SqlConnection("Initial Catalog=Shaily_db;Data Source=DU-PC;Integrated Security=SSPI");

con.Open();

SqlCommand cmd = new SqlCommand("Select * from Student_Comp where Complaint_Status='Resolved'", con);

SqlDataReader dr = cmd.ExecuteReader();

GridView1.DataSource = dr;

GridView1.DataBind();

con.Close();

}

public void GridviewBind2()

{

SqlConnection con = new SqlConnection("Initial Catalog=Shaily_db;Data Source=DU-PC;Integrated Security=SSPI");

con.Open();

SqlCommand cmd = new SqlCommand("Select * from Student_Comp where Complaint_Status='Pending'", con);

SqlDataReader dr = cmd.ExecuteReader();

GridView1.DataSource = dr;

GridView1.DataBind();

con.Close();

}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

{

}

private string ConnectionString

{

get

{

return @"Server=localhost;Database=Shaily_db;

Trusted_Connection=true";

}

private DataSet BindData()

{

// make the query

string query = "SELECT * FROM Student_Comp";

SqlConnection myConnection = new SqlConnection(ConnectionString);

SqlDataAdapter ad = new SqlDataAdapter(query, myConnection);

DataSet ds = new DataSet();

ad.Fill(ds, "Student_Comp");

return ds;

}

protected void Button2_Click(object sender, EventArgs e)

{

GridView1.Visible = true;

Response.Clear();

Response.AddHeader("content-disposition", "attachment; filename=FileName.xls");

Response.Charset = "";

// If you want the option to open the Excel file without saving than

// comment out the line below

// Response.Cache.SetCacheability(HttpCacheability.NoCache);

Response.ContentType = "application/vnd.xls";

System.IO.StringWriter stringWrite = new System.IO.StringWriter();

System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

GridView1.RenderControl(htmlWrite);

Response.Write(stringWrite.ToString());

Response.End();

}

public override void VerifyRenderingInServerForm(Control control)

{

}

public void gvbind()

{

conn.Open();

SqlCommand cmd = new SqlCommand("Select * from Student_Comp", conn);

SqlDataAdapter da = new SqlDataAdapter(cmd);

DataSet ds = new DataSet();

da.Fill(ds);

conn.Close();

if (ds.Tables[0].Rows.Count > 0)

{

GridView1.DataSource = ds;

GridView1.DataBind();

}

else

{

ds.Tables[0].Rows.Add(ds.Tables[0].NewRow());

GridView1.DataSource = ds;

GridView1.DataBind();

int columncount = GridView1.Rows[0].Cells.Count;

GridView1.Rows[0].Cells.Clear();

GridView1.Rows[0].Cells.Add(new TableCell());

GridView1.Rows[0].Cells[0].ColumnSpan = columncount;

GridView1.Rows[0].Cells[0].Text = "No Records Found";

}

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)

{

GridView1.Visible = true;

GridView1.EditIndex = e.NewEditIndex;

gvbind();

}

protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)

{

GridView1.Visible = true;

GridView1.EditIndex = -1;

gvbind();

}

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)

{

GridView1.Visible = true;

int userid = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString());

GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];

Label lblID = (Label)row.FindControl("lblID");

TextBox Student_Name = (TextBox)row.Cells[0].Controls[0];

TextBox Roll_No = (TextBox)row.Cells[1].Controls[0];

TextBox Contact_No = (TextBox)row.Cells[2].Controls[0];

TextBox Date = (TextBox)row.Cells[3].Controls[0];

TextBox Request_No = (TextBox)row.Cells[4].Controls[0];

TextBox Type_of_Problem = (TextBox)row.Cells[5].Controls[0];

TextBox Course = (TextBox)row.Cells[6].Controls[0];

TextBox Exam_Type = (TextBox)row.Cells[7].Controls[0];

TextBox College = (TextBox)row.Cells[8].Controls[0];

TextBox Complaint_status = (TextBox)row.Cells[9].Controls[0];

TextBox Remarks = (TextBox)row.Cells[10].Controls[0];

GridView1.EditIndex = -1;

conn.Open();

SqlCommand cmd;

cmd = new SqlCommand("update Student_Comp set Student_Name='" + Student_Name.Text + "' , Roll_No='" + Roll_No.Text + "' , Contact_No='" + Contact_No.Text + "','" + Date.Text + "', '" + Request_No.Text + "', '" + Type_of_Problem.Text + "', '" + Course.Text + "','" + Exam_Type.Text + "', '" + College.Text + "','" + Complaint_status.Text + "','" + Remarks.Text + "', where Roll_No=" + userid + "", conn);

cmd.ExecuteNonQuery();

conn.Close();

gvbind();

//GridView1.DataBind();

}

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)

{

GridView1.Visible = true;

GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];

Label lbldeleteid = (Label)row.FindControl("lblID");

conn.Open();

SqlCommand cmd = new SqlCommand("delete FROM Student_Comp where Roll_No='" + Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString()) + "'", conn);

cmd.ExecuteNonQuery();

conn.Close();

gvbind();

}

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)

{

GridView1.PageIndex = e.NewPageIndex;

gvbind();

}