Multiple Search values added into single Grid view and update using check box selection :

(Note: I have use to connect the database in Mysql )

See below demo video for reference :

Click to play video 

Screen Shot 1: 

Screen Shot 2:

Screen Shot 3: 

Screen Shot 4: 

Codes:

Design Picture :

Fist you need to design the page like in Visual Studio 2010.

aspx code:

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="grnreceive.aspx.cs" Inherits="grnreceive" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    <style type="text/css">
        .style1
        {
            height: 42px;
        }
    </style>
     <style type="text/css">
        :focus {
        background-color:white;

        }

    </style>
    </asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <center> <h3> GRN RECEIVE </h3></center>

    <center>
        <table style="height: 61px; width: 393px">
            <tr>
                <td class="style1">
                    &nbsp;
                    Enter Material Number</td>
                <td class="style1">
                    <asp:TextBox ID="txtsrch" runat="server" Height="25px" Width="127px"></asp:TextBox>
                    &nbsp;
                </td>
                <td class="style1">
                    &nbsp;<asp:Button ID="bnadd" runat="server" Text="Add" onclick="bnadd_Click" 
                        Height="30px"  style="font-size: large" />
&nbsp;</td>
            </tr>
            <tr>
                <td colspan="3">
                    &nbsp;
                    &nbsp;
                    <asp:Label ID="lblerror" runat="server" Text="Label"></asp:Label>
                    &nbsp;
                </td>
            </tr>
            </table>
    </center>
    <br />
    <br />
    <center>
    <asp:GridView ID="grdvw" runat="server">
     <Columns>
    <asp:TemplateField>
    <HeaderTemplate>
    <asp:CheckBox ID="checkboxalldelete" runat="server" AutoPostBack="true" OnCheckedChanged="checkrow" />
    </HeaderTemplate>
    <ItemTemplate>
    <asp:CheckBox ID="checkdelete" runat="server" AutoPostBack="true" /></ItemTemplate>
    <HeaderStyle HorizontalAlign="Justify" />
    </asp:TemplateField>  
    </Columns>
    </asp:GridView>
    </center>

<br />
<br />
<center>
    <asp:Button ID="bnsave" runat="server" Text="Save" Height="30px"  style="font-size: large" onclick="bnsave_Click" />
    <br />
</center>
    <br />
    <br />
</asp:Content>




C# code:
(Rename it your lables , textboxs,buttons,gridviews)


Like Below:

label1=lblerror,
Textbox=txtsrch,
Gridview1=grvw,

Button=grdvw.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using MySql.Data.MySqlClient;
using System.Globalization;
using System.Configuration;

public partial class grnreceive : System.Web.UI.Page
{
    string createdon;
    string ipaddr;
    DataTable tbs = new DataTable();
    DataRow drow;
    
    protected void Page_Load(object sender, EventArgs e)
    {
       
        string strHostName = null;
        strHostName = System.Net.Dns.GetHostName();
        ipaddr = System.Net.Dns.GetHostEntry(strHostName).AddressList[0].ToString();
        createdon = DateTime.Now.ToString("yyyy-MM-dd");
        lblerror.Visible = false;
        if(!IsPostBack)
        {
            txtsrch.Focus();
            create_table();

        }

    }
     protected void create_table()
    {
        tbs.Columns.Add("GRNNO", typeof(string));
        tbs.Columns.Add("GRN DATE", typeof(string));
        tbs.Columns.Add("DEPARTMENT NAME", typeof(string));
        tbs.Columns.Add("PROBLEM METERIAL DETAILS", typeof(string));
        tbs.Columns.Add("PROBLEM", typeof(string));
        tbs.Columns.Add("STAND BY METERIAL DETAILS", typeof(string));
        tbs.Columns.Add("STAFF NAME", typeof(string));
        tbs.Columns.Add("TRACK ITEM", typeof(string));
        grdvw.DataSource = tbs;
        grdvw.DataBind();
        ViewState["table"] = tbs;
    }
     protected void bnadd_Click(object sender, EventArgs e)
     {
         string connString = ConfigurationManager.ConnectionStrings["constr1"].ConnectionString;
         MySqlConnection myConnection = new MySqlConnection(connString);
         myConnection.Open();
         tbs = (DataTable)ViewState["table"];
         drow = tbs.NewRow();
      
         MySqlCommand cmd = new MySqlCommand("select grnno,grndate,deptname,pmdetails,problem,standby,staffname,trackitem from grntable where trackitem='DSR' and grnno='" +txtsrch.Text + "'", myConnection);
         MySqlDataReader dr = cmd.ExecuteReader();

         if (dr.Read())
         {

             string grn = dr["grnno"].ToString();
             string grn1 = dr["grndate"].ToString();
             string grn2 = dr["deptname"].ToString();
             string grn3 = dr["pmdetails"].ToString();
             string grn4 = dr["problem"].ToString();
             string grn5 = dr["standby"].ToString();
             string grn6 = dr["staffname"].ToString();
             string grn7 = dr["trackitem"].ToString();
             string grn8 = txtsrch.Text;
             drow["GRNNO"] = grn;
             drow["GRN DATE"] = grn1;
             drow["DEPARTMENT NAME"] = grn2;
             drow["PROBLEM METERIAL DETAILS"] = grn3;
             drow["PROBLEM"] = grn4;
             drow["STAND BY METERIAL DETAILS"] = grn5;
             drow["STAFF NAME"] = grn6;
             drow["TRACK ITEM"] = grn7;
             tbs.Rows.Add(drow);
             grdvw.DataSource = tbs;
             grdvw.DataBind();
             txtsrch.Text = "";
             myConnection.Close();
             lblerror.Visible = true;
             lblerror.Text="Sucessfully Added,Try Another";
            
         }
         else
         {
             lblerror.Visible = true;
             lblerror.Text = "Invalid Material Number";

         }

     
     }
    protected void  bnsave_Click(object sender, EventArgs e)
{


    string connString = ConfigurationManager.ConnectionStrings["constr1"].ConnectionString;
    MySqlConnection myConnection = new MySqlConnection(connString);
    myConnection.Open();
    MySqlTransaction tran = myConnection.BeginTransaction();
    try
    {
        for (int i = 0; i < grdvw.Rows.Count; i++)
        {
            CheckBox chkdelete = (CheckBox)grdvw.Rows[i].Cells[0].FindControl("checkdelete");
            string matno = grdvw.Rows[i].Cells[1].Text;

            if (chkdelete.Checked == true)
            {
                MySqlCommand cmd1 = new MySqlCommand("update grntable set trackitem='GSC',modifiedon='" + createdon + "',modifiedby='" + txtsrch.Text + "',modifiedat='" + ipaddr + "' where grnno='" + matno + "'", myConnection, tran);
                cmd1.ExecuteNonQuery();

            }

        }
        tran.Commit();
        myConnection.Close();
        ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertmessage", "alert('Scucess')", true);

    }
    catch (Exception)
    {
        tran.Rollback();
        myConnection.Close();
    }
    myConnection.Close();
    Response.Redirect("grnreceive.aspx");
}
    protected void checkrow(object sender, EventArgs e)
    {
        
        CheckBox chkheader = (CheckBox)grdvw.HeaderRow.FindControl("checkboxalldelete");
        if (chkheader.Checked == true)
        {
            for (int i = 0; i < grdvw.Rows.Count; i++)
            {
                CheckBox chkrr = (CheckBox)grdvw.Rows[i].Cells[0].FindControl("checkdelete");
                chkrr.Checked = true;
            }
        }
        else
        {
            for (int i = 0; i < grdvw.Rows.Count; i++)
            {
                CheckBox chkrr = (CheckBox)grdvw.Rows[i].Cells[0].FindControl("checkdelete");
                chkrr.Checked = false;
            }
        }
    }

    }

Database : 

To create database :

create database jkt;

Open particular database :

use jkt;

Create a new table: 

create table grntable
(
grnno int(11) not null auto_increment primary key ,
grndate date,
deptname  varchar(100),
pmdetails  varchar(250),
problem varchar(200),
standby varchar(10),
staffname varchar(50),
trackitem   varchar(10)
);

Description for the table :

desc grntable;

Select all values from table :

select * from grntable;

Insert values into the table:

insert into grntable (grnno,grndate,deptname,pmdetails,problem,standby,staffname,trackitem) 

values

(01,now(),'Hardware','Mouse','Click button not working','yes','John','DSR

'),

(02,now(),'Network','Printer','Paper not working','yes','Jagan','DSR

'),

(032,now(),'Hardware','Keyboard','Keys not working','yes','Sathish','DSR

');

  

Picture for table Structure: