Question

I need to execute the following command and pass the result to a label. I don’t know how can i do it using Reader. Someone can give me a hand?

String sql = "SELECT * FROM learer WHERE learer.id = " + index;
SqlCommand cmd = new SqlCommand(sql,conn);
learerLabel.Text = (String) cmd.ExecuteReader();

As you can see i create the SQL statement and i execute it, but it does not work. Why?

The console says:

Cannot implicitly SqlDataReader to
String…

How can i get the desired results as String so the label can display it properly.

Answer 1

It is not recommended to use DataReader and Command.ExecuteReader to get just one value from the database. Instead, you should use Command.ExecuteScalar as following:

String sql = "SELECT ColumnNumber FROM learer WHERE learer.id = " + index;
SqlCommand cmd = new SqlCommand(sql,conn);
learerLabel.Text = (String) cmd.ExecuteScalar();

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