ASP.NET with Sql Server(Data Storing)

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ASP.NET

SQL

server

I am using this code to store data into a table in sql server. But it shows me an error:"C# code to insert data in database".

Here is my code:
using System.Data.SqlClient;


protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection cnn = new SqlConnection();
cnn.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["sqlconnection "].ConnectionString;
cnn.Open();
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "select * from TableName";
cmd.Connection = cnn;
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
DataSet ds = new DataSet();
da.Fill(ds, " TableName ");
SqlCommandBuilder cb = new SqlCommandBuilder(da);
DataRow drow = ds.Tables["TableName"].NewRow();
drow["id"] = TextBox1.Text;
drow["Name"] = TextBox2.Text;
drow["Designation"] = TextBox3.Text;
drow["Mobile_No"] = TextBox4.Text;
drow["Address"] = TextBox5.Text;

ds.Tables["TableName "].Rows.Add(drow);
da.Update(ds, " TableName ");
string script = @"<script language=""javascript"">
alert('Information have been Saved Successfully.......!!!!!.');
</script>;";
Page.ClientScript.RegisterStartupScript(this.GetType(), "myJScript1", script);
}

//In web.config

<connectionStrings>
<add name="sqlconnection" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient"/>
  </connectionStrings>
Please Help me....