how to i search if there is a same id in a database?

Question

How do i check if there is a same id when you trying to add a data to database?

For example, if i have Name \"Leo Chan\" with id \'5\' in the list

and when i wan

Answer 1

DataTable dt = new DataTable();
string query = string.format("SELECT * from table WHERE ID = {0}", ID);

using(SqlDataAdapter sda = new SqlAdapter(query, con))
{
     sda.fill(dt)
     if(dt.Rows.count > 0)
     {
         showErrorMessage();
         return;
     }
}

I know there are multiple ways to read from a database, but I like using SqlDataAdapters, because you really don't have to create a SqlConnection or a SqlCommand. SqlDataAdapter does it for you.