Write Query to Clear column data in SQL Server

hi this is my HOuse_p table

i have fileupload control and delete button in my page

 i want when users upload their file after that they can delete it from table

here when users upload file it save in image1.column i want when users click on delete button it delete imge from image1 column i wrote this sp but i dont know what should i write for image

SP

create procedure dbo.deleteproduct
@behcode varchar(10),
@image varchar(30)

as

begin
delete
from House_p
where behcode=@behcode and Image1=@image
end

CODE

    protected void Button1_Click(object sender, EventArgs e)
    {

        SqlCommand _cmd = new SqlCommand("deleteproduct", _cn);
        _cmd.CommandType = CommandType.StoredProcedure;
        
        string data = Server.UrlDecode(Request.QueryString["BehCode3"]);
        _cn.Open();
        _cmd.Parameters.AddWithValue("@Behcode", data);
        _cmd.Parameters.AddWithValue("@image",

        _cn.Close();

    }

BEst Regards