Question

I got this:

+--------+------+
| id  | name    |
+--------+------+
| 1   | George  |  
| 2   | Mathew  |  
| 3   | Michael | 
| 4   | Jones   |
+--------+------+

Now what I want to do is this.

I want to find my name Michael and copy the id “3” of Michael into a string variable in VS10

Answer 1

You need the following query to select the id column from the table and specifying the name condition in the WHERE clause

Select id from table where name = 'Michael'

If you are using Csharp in visual studio 2010, you can do something like this:

string idValue = String.Empty
string query = " Select id from table where name = 'Michael'";
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand command = new SqlCommand(query, connection);
SqlDataReader reader;
connection.Open();
reader = command.ExecuteReader();
While(reader.Read())
{
idValue = reader["id"].ToString();
}
connection.Close();
return idValue;

In the above code, idValue is the id of the name you searching for and connectionStringis a connection string to your database.

You can also use lambda like this:

string idVal = Table.Where(a => a.name== "Michael")
               .Select(x => x.Id).FirstOrDefault().ToString();