如何在sql查询中从db中划分列上的textBox？

Question

How to divide textBox8 on value of Price

Int32 readSearch2 = Convert.ToInt32(textBox8.Text);
SqlCommand command = new SqlCommand("SELECT [Price] FROM [Products] ", sqlConnection);

Answer 1

You can do it by adding a SqlCommand Parameter, but as I mentioned in the comments, note that you may have many records in Products table and it will affect all prices (for all records):

SqlCommand command = new SqlCommand("SELECT @val/[Price] as Price FROM [Products] ", sqlConnection);

cmd.Parameters.Add("@val", SqlDbType.Float).Value = double.Parse(TextBox8.Text);