Insert Command In Sql Server Express Edition Using ASP.net C# Lan

Hi,

 i'm creating registeration form using VS2005, i want to insert values in sql server express 2005. i've coded but it is giving error plz hava a look

 for example my database name is Database1 and table is table1

and columns are name,title. 

here i'm getting error : connectionstring does not exist. 

 

code as folllows

SqlConnection connection = new SqlConnection(ConnectionString1);
      

        string cmdString = "Insert into Table1(name,title)VALUES( @Name,@title)";

        SqlCommand cmd = new SqlCommand(cmdString, connection);

        cmd.Parameters.Add(new SqlParameter("@name",txtNameText)); 
        cmd.Parameters.Add(new SqlParameter("@title",txtTitle.Text) );
                
        connection.Open();
        cmd.ExecuteNonQuery();
        connection.Close();

 

thanks in advance