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Thank you so much... that did it...
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Using the following statement:<br />
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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; commandString = &quot;IF NOT EXISTS(SELECT 1 FROM syscolumns WHERE name = 'SubCatID')&quot; <br />
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Is there a way that I can use this partial statement to control C# statements that follow? &nbsp;(kind of an IF followed by a block of C# statements). &nbsp;I want to be able to alter a table to a new format if the table has not been altered before. &nbsp;It's not a simple job, because I have to backup the old table data, delete the old table, create a new table and then restore some of the data.
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Using the following statement:

            commandString = "IF NOT EXISTS(SELECT 1 FROM syscolumns WHERE name = 'SubCatID')" 

Is there a way that I can use this partial statement to control C# statements that follow?  (kind of an IF followed by a block of C# statements).  I want to be able to alter a table to a new format if the table has not been altered before.  It's not a simple job, because I have to backup the old table data, delete the old table, create a new table and then restore some of the data.

How to use a SQL statement to control a block of C# statements

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.