C# Sql Data Reader error

I have a web form with 11 text boxes and 1 radio button list (Containing two LI's).

txtCustID - Required (Generated by getting the max CustID number from database and incrementing value)

txtFirstname - Requried
txtSurname - Required
rdbGender -> Male, Female - Required
txtAge - Required
txtAddress1 - Requried
txtAddress2 - Not required
txtCity - Required
txtPhone - Required
txtMobile - Not required
txtEmail1 - Required
txtEmail2 - Required (Used to confirm Email1, not passed to DB)

There's a button, btnAdd which passes the text values to a stored procedure "AddRecord" in the database.

It is returning an error "Procedure or function 'AddRecord' expects parameter '@Surname', which was not supplied."

I can't find the issue, as @Surname is supplied?

Here's the btnClick event code:

protected void btnAdd_Click(object sender, EventArgs e)
{
        SqlCommand command = new SqlCommand();

        command.Connection = conn;
        command.CommandType = CommandType.StoredProcedure;
        command.CommandText = "AddRecord";
        command.Connection.Open();

        SqlParameter pCustID = new SqlParameter();
        pCustID.ParameterName = "@CustID";
        pCustID.SqlDbType = SqlDbType.Int;
        pCustID.Direction = ParameterDirection.Input;
        pCustID.Value = txtCustID.Text;
        command.Parameters.Add(pCustID);

        SqlParameter pFirst = new SqlParameter();
        pFirst.ParameterName = "@First";
        pFirst.SqlDbType = SqlDbType.VarChar;
        pFirst.Direction = ParameterDirection.Input;
        pFirst.Value = txtFirstName.Text;
        command.Parameters.Add(pFirst);

        SqlParameter pSurn = new SqlParameter();
        pSurn.ParameterName = "@Surname";
        pSurn.SqlDbType = SqlDbType.VarChar;
        pSurn.Direction = ParameterDirection.Input;
        pSurn.Value = txtSurname.Text;
        command.Parameters.Add(pSurn);

        SqlParameter pGen = new SqlParameter();
        pSurn.ParameterName = "@Gender";
        pSurn.SqlDbType = SqlDbType.VarChar;
        pSurn.Direction = ParameterDirection.Input;
        pSurn.Value = rblGender.SelectedValue;
        command.Parameters.Add(pGen);

        SqlParameter pAge = new SqlParameter();
        pSurn.ParameterName = "@Surname";
        pSurn.SqlDbType = SqlDbType.Int;
        pSurn.Direction = ParameterDirection.Input;
        pSurn.Value = txtAge.Text;
        command.Parameters.Add(pAge);

        SqlParameter pAdd1 = new SqlParameter();
        pSurn.ParameterName = "@Address1";
        pSurn.SqlDbType = SqlDbType.VarChar;
        pSurn.Direction = ParameterDirection.Input;
        pSurn.Value = txtAddress1.Text;
        command.Parameters.Add(pAdd1);

        SqlParameter pAdd2 = new SqlParameter();
        pSurn.ParameterName = "@Address2";
        pSurn.SqlDbType = SqlDbType.VarChar;
        pSurn.Direction = ParameterDirection.Input;
        pSurn.Value = txtAddress2.Text;
        command.Parameters.Add(pAdd2);

        SqlParameter pCity = new SqlParameter();
        pSurn.ParameterName = "@City";
        pSurn.SqlDbType = SqlDbType.VarChar;
        pSurn.Direction = ParameterDirection.Input;
        pSurn.Value = txtCity.Text;
        command.Parameters.Add(pCity);

        SqlParameter pPhone = new SqlParameter();
        pSurn.ParameterName = "@Phone";
        pSurn.SqlDbType = SqlDbType.VarChar;
        pSurn.Direction = ParameterDirection.Input;
        pSurn.Value = txtPhone.Text;
        command.Parameters.Add(pPhone);

        SqlParameter pMobile = new SqlParameter();
        pSurn.ParameterName = "@Mobile";
        pSurn.SqlDbType = SqlDbType.VarChar;
        pSurn.Direction = ParameterDirection.Input;
        pSurn.Value = txtMobile.Text;
        command.Parameters.Add(pMobile);

        SqlParameter pEmail = new SqlParameter();
        pSurn.ParameterName = "@Email";
        pSurn.SqlDbType = SqlDbType.VarChar;
        pSurn.Direction = ParameterDirection.Input;
        pSurn.Value = txtEmail1.Text;
        command.Parameters.Add(pEmail);

        SqlDataReader reader = command.ExecuteReader();

        reader.Dispose();
        command.Dispose();
        conn.Dispose();
    }
}

Here's the stored procedure code:

CREATE PROCEDURE AddRecord
    @CustID INT,
    @First VARCHAR,
    @Surname VARCHAR,
    @Gender VARCHAR,
    @Age INT, 
    @Address1 VARCHAR,
    @Address2 VARCHAR,
    @City VARCHAR,
    @Phone VARCHAR,
    @Mobile VARCHAR,
    @Email VARCHAR
AS
    INSERT INTO Customer
    VALUES
      (@CustID, @First, @Surname, @Gender, @Age, @Address1,  @Address2,
       @City, @Phone, @Mobile, @Email);