Insert Single Value With Stored Procedure ASP.NET C#

Code for calling stored procedure in the Code-Behind to insert a single value from a text box.

aspx:

<asp:Label ID="Label1" runat="server" Visible="false"></asp:Label><br />
Add Category: <asp:TextBox ID="txtCategory" runat="server"></asp:TextBox><br />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />

Stored Procedure:

CREATE PROCEDURE [dbo].[AddCategory] 
  @Category nvarchar(20)
AS
BEGIN
  -- SET NOCOUNT ON added to prevent extra result sets from
  -- interfering with SELECT statements.
  SET NOCOUNT ON;

  INSERT INTO CATEGORIES (Category) VALUES (@Category)
END

aspx.cs:

protected void Button1_Click(object sender, EventArgs e)
{
string ArticleType = txtArticleType.Text;
string connectionString = Utils.GetConnString();
        
using (SqlConnection conn = new SqlConnection(connectionString))
  {	
			
   using (SqlCommand cmd = new SqlCommand("AddArticleType", conn))
    {
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@ArticleType", ArticleType);
    conn.Open();
    cmd.ExecuteNonQuery();
    }
  }
}