How to insert the data into gridview using textboxes in asp.net?

I would like to explain about inserting values into textbox and that will be displayed in grid view 
so  for that  
In visual studio click on file -->New project-->Add weapplication-> add new item-->
add new web form

In .aspx page:

  <table>
        <tr><td>Name:</td><td>
            <asp:TextBox ID="txt_name" runat="server"></asp:TextBox></td></tr>
            <tr><td>Description:</td><td>
                <asp:TextBox ID="txt_description" runat="server"></asp:TextBox></td></tr>
                <tr><td>Department:</td><td>
                    <asp:TextBox ID="txt_depart" runat="server"></asp:TextBox></td></tr>
                    <tr><td colspan="2" align="center">
                        <asp:Button ID="Button1" runat="server" Text="Submit" onclick="Button1_Click" /></td></tr>
        </table>
<asp:label: id="1abel1" runat="server" >

The page will be display like this 
code in .aspx.cs page:
 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public partial class insert : System.Web.UI.Page
    {
        string strcon = ConfigurationManager.ConnectionStrings["sqlconn"].ConnectionString;
// you have to add configuration in name space .
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
            }
        }
code in button click event

        protected void Button1_Click(object sender, EventArgs e)
        {
try
{
            SqlConnection con = new SqlConnection(strcon);
            SqlCommand cmd = new SqlCommand("insert_sp_emp", con);
 //here i passed stored procedure instead ofinsert  query.
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@Name", txt_name.Text);
            cmd.Parameters.AddWithValue("@Description", txt_description.Text);
            cmd.Parameters.AddWithValue("@Department", txt_depart.Text);
            con.Open();
            cmd.ExecuteNonQuery();
       label1.text="Record Inserted Succesfully;
            con.Close();
}
catch(Exception,ex)
{
label1.Text=ex.message;
}
        }
    }
}
in sql server 
 crete table 
and write  procedure for insert query i.e,

create procedure insert_sp_emp(@Name nvarchar(50),@Description nvarchar(50),@Department nvarchr(50))
AS
BEGIN
insert into tablename(Name,Description,Department) values(@Name,@Description,@Department)
END

if you set an identity true no need to mention id as parameter-(@Id int)

Web Config file:

<configuration>
  <connectionStrings>
    <add name="sqlconn" connectionString="Data Source=SYS-2;Initial Catalog=Emp;Integrated Security=True"/>

  </connectionStrings>

So build your application and start debugging then it shown your output like this 

then you have to display the complete record into gridview using asp.net:
in .aspx page:
drag and drop gridview from datbound controls
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
            <Columns>
                <asp:BoundField DataField="Id" HeaderText="Id" />
                <asp:BoundField DataField="Name" HeaderText="Name" />
                <asp:BoundField DataField="Description" HeaderText="Description" />
                <asp:BoundField DataField="Department" HeaderText="Department" />
            </Columns>


        </asp:GridView>

code in .aspx.cs page:
 public void binddata()
        {
            SqlConnection con = new SqlConnection(strcon);
            SqlCommand cmd = new SqlCommand("select* from Emp", con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            GridView1.DataSource = ds;
            GridView1.DataBind();

        }
In button click event  you have to mention 
bindata(); before con.close();//connection close
then build the and debug the code once
then it will be displayed liked this

so it is useful for beginners who are learning asp.net newly
I hope you understand  raise a query you have any doubt about this