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convert string to int before updating database table?

Posted By:      Posted Date: September 23, 2010    Points: 0   Category :ASP.Net

I have a form in which I display data from a database table, change the data and then update the database table. The form consists of textboxes, so all data displayed in the form is string. However - one data is int in the database table (the rest is varchar), so I need to convert it from string to int when I update the database table. How do I do it?

protected void SaveProd_Click(object sender, EventArgs e)
        string BildID = TextBoxProdPictID.Text;
        string namn = TextBoxProdName.Text;
        string kategori = TextBoxProdCategory.Text;
        string stl = TextBoxProdSize.Text;
        string pris = TextBoxProdPrice.Text;
        string iLager = TextBoxProdNumberOf.Text; //this is int in the database table

        SqlConnection conn = new SqlConnection(config);
      //  conn.Open();
        string sql = "UPDATE Produkter SET kategori ='" + kategori + "', namn ='" + namn + "', stl ='" + stl + "', pris ='" + pris + "', iLager ='" + iLager + "' WHERE ID ='" + ID + "'";
        SqlCommand comm = new SqlCommand(sql, conn);//Conversion failed when converting the varchar value '__Page' to data type int.
        SqlDataReader dr = comm.ExecuteReader(); 

        //clear t

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