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//Creates connection

//@"Server=[local computer]"
//Integrated Security=yes, means Windows Authentication
//Database=[database name]"

SqlConnection miConexion = new SqlConnection(
                           @"Server=AE-PC\SQLEXPRESS; 
                           Integrated Security=yes;
                           Database=clientes");

//Insertion string
//use "+ this.CSharpElement +" to add values from form.
//to capture strings use: '"+this.string+"'
//to capture numbers use:  "+this.number+"
            
string strComando = "INSERT INTO cliente VALUES ('" +this.textBoxName.Text      +"','"
                                                    +this.textBoxSurname.Text   +"', "
                                                    +this.textBoxAge.Text       +"     );";
            
//Console.WriteLine(strComando);
SqlCommand miComando = new SqlCommand(strComando, miConexion);

try
{
  //Opens the connection
  miConexion.Open();
  
  //Used to get the error
  miComando.ExecuteNonQuery();
  Console.WriteLine("Data Added");
  //this.dataGridView1.Update();
}
catch (Exception Error)
{
  Console.WriteLine(Error.Message);
}
finally
{
  if (miConexion.State == ConnectionState.Open)
  {
    miConexion.Close();
  }            
}