How to use sql parameters for a select query?

Question

I need to fetch the records based on a \'like\' match against a set of records,

The below query im using is not working . Does anyone knows what\'s wrong with the query?

Answer 1

String.Format needs a placeholder, like {0} {1} etc.

sqlCommand.CommandText = "SELECT * FROM Customer WHERE Name LIKE @Name;";
sqlCommand.Parameters.AddWithValue("@Name", String.Format("%{0}%", searchString));