Error in insertion data to sql server in asp.net

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ASP.NET

Hi i have problem in asp.net when i try to insert record to my db
and i get this error

An explicit value for the identity column in table 'wiki' can only be specified when a column list is used and IDENTITY_INSERT is ON.

and i have search for solution and i get that i must write the follwing,and i don't know where to write it or if it's a right solution

SET IDENTITY_INSERT wiki OFF how to write it in asp.net

here is my code:

string qry;

            //String file_id=TextBox1.Text;
            String file_name = TextBox2.Text;
            String file_size = TextBox3.Text;
            String file_url = TextBox4.Text;
            String file_category = TextBox5.Text;
            String file_view = TextBox6.Text;
         //  String emp_id = TextBox7.Text;
            SqlConnection con = new SqlConnection(@"Data Source=SNIPERGHOST-PC\SQLEXPRESS;Initial Catalog=PM;Integrated Security=True;Pooling=False");
            con.Open();
            SqlCommand cmd;
            SqlDataSource sds = new SqlDataSource();
            
            qry = "insert into wiki values('" + file_name + "','" + file_size + "','" + file_url + "','" + file_category + "','" + file_view +"','"+ "')";
           

            cmd = new SqlCommand(qry, con);

            cmd.ExecuteNonQuery();
            con.Close();

            //Image1.Visible = true;
            string ToRedirectURL = "viewfiles.aspx";
            Response.AppendHeader("REFRESH", "5;URL=" + ToRedirectURL);
            // Response.Redirect("comment.aspx",true);