C# data search in database using gridview

I am using service-based Database and entity model for creating and recording data.I am able to record and view the data in gridview. But I need to search the data In the gridview. How I can I do this Plz help.

(suppose I record 3 data..the names are A,B,C...when I write in the textbox is A then I need to show the full data of A, that means only the table row of A....(means the name,bloodgroup,address and cellno of A)

form 1 code:

    using System;

    using System.Collections.Generic;

    using System.ComponentModel;

    using System.Data;

    using System.Drawing;

    using System.Linq;

    using System.Text;

    using System.Windows.Forms;

    

    namespace BloddBankManagement

    { 

        public partial class BloodBankForm : Form

        {

            

    

            public BloodBankForm()

            {

                InitializeComponent();

                

            }

    

            

    

            private void Btnregister_click(object sender, EventArgs e)

            {   

                

                RegisterUser user = new RegisterUser();

                user.Show();

            }

    

            private void buttonview_Click(object sender, EventArgs e)

            {

                ViewRecords record = new ViewRecords();

                record.Show();

            }

        }

    }

RegisterUser code:

    using System;

    using System.Collections.Generic;

    using System.ComponentModel;

    using System.Data;

    using System.Drawing;

    using System.Linq;

    using System.Text;

    using System.Windows.Forms;

    using System.Data.SqlClient;

    

    namespace BloddBankManagement

    {

        public partial class RegisterUser : Form

        {

            private Database1Entities2 bloodbank= new Database1Entities2();

    

            public RegisterUser()

            {

                InitializeComponent();

            }

    

           private void button1click_register(object sender, EventArgs e)

            {

                BloodBankM bank = new BloodBankM();

                

                String name1 = textBox1.Text;

                String bldgrp=textBox2.Text;

                String address = textBox3.Text;

                String cellno = textBox4.Text;

    

                bank.Name = name;

                bank.Bloodgroup = after;

                bank.Address = address;

                bank.Cellno = cellno;

           

                bloodbank.AddToBloodBankMs(bank);

                bloodbank.SaveChanges();

                MessageBox.Show("Record Saved");

                    }

    

        }

    }

ViewRecordscode:

    using System;

    using System.Collections.Generic;

    using System.ComponentModel;

    using System.Data;

    using System.Drawing;

    using System.Linq;

    using System.Text;

    using System.Windows.Forms;

    using System.Data.Objects;

    using System.Data.SqlClient;

    

    namespace BloddBankManagement

    {

        public partial class ViewRecords : Form

        {

            private Database1Entities2 bloodbank = new Database1Entities2();

    

            public ViewRecords()

            {

                InitializeComponent();

                dataGridView1.DataSource = bloodbank.BloodBankMs;

            }

    

    

    

            private void textBox1_TextChanged(object sender, EventArgs e)

            {

                      //I need the data search code here

            }

    

                

            }

        }