c# external sql server queries

We have a C# application, for some reasons i wont go into we are unable to use Entity Framework.

That being said I still prefer to have parameterized sql statements external from my application code, especially the large ones.  For most small CRUD based options I have just written a simple class to map the objects etc.  

What would be the best way to externalize the sql queries but still allow some dynamic parameters, Ill provide a simple example here

StringBuilder x = new StringBuilder();
x.AppendFormat("select * from Customers where CustomerId = {0}", this.CustomerId);
Brant SnowAsked:
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You can still use parameterized queries in an inline / ad hoc sql statement.  Added in the same way as you would a stored procedure.  Tough to give a real example without seeing the code (and how / what you're adding to the query), but something like this:

            SqlCommand com = new SqlCommand(string.Empty);

            StringBuilder x = new StringBuilder();
            x.Append("select * from Customers where CustomerId = @customerID");
            com.Parameters.AddWithValue("@customerID", this.CustomerId);

            //whatever other dynamic properties you have, added in the same way

            com.CommandText = x.ToString();
            com.ExecuteNonQuery();      //or whatever method you need

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That's completely safe from injection attacks, and will pass the query to the sql engine AS parameters.

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Agree with @Snarf. We make use of the Microsoft patterns and practices enterprise library - data access block (https://msdn.microsoft.com/en-us/library/dn169621.aspx). You can get this via nuget (https://www.nuget.org/packages/EnterpriseLibrary.Data/). It offers some improvements over directly writing data access code (e.g. it will manage opening and closing connections for you, connection pooling, and such). It is easy to use and works very well (tutorial: http://www.4guysfromrolla.com/articles/030905-1.aspx).
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