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in the update query its giving an exception as [B][COLOR="Red"]Operand data type varchar is invalid for subtract operator[/COLOR][/B] so pls help me how to solve this [code] da7 = new SqlDataAdapter("SELECT item_name, item_quan,item_cat FROM c_item WHERE (item_name = '" + fname + "') AND (item_cat = '1')", con); da7.Fill(dt7); string … 
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