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    <p>Perhaps you should remove the semicolon at the end of Read</p> <pre><code>while (reader_sql.Read()) { for (int rr = 0; rr &lt; 20; rr++) colName[rr] = reader_sql["COLUMN_NAME"].ToString(); } </code></pre> <p>However, if your intention is to retrieve the columns belonging to the primary key, your code is wrong because you add 20 times the same primary key column, then repeat the same for the remaining columns ending with an array of 20 strings all equals to the last column in the primary key set. I think you should change your code to use a List(Of String) instead of a fixed length array and let the reader loop correctly on the primary key columns retrieved</p> <pre><code>List&lt;string&gt; pks = new List&lt;string&gt;(); while (reader_sql.Read()) { pks.Add(reader_sql["COLUMN_NAME"].ToString()); } </code></pre> <p><strong>EDIT:</strong> I have just noticed that your query contains a space before the table name. The string concatenation then produces an invalid table name, the query is syntactically right but doesn't return any data</p> <pre><code>string sql = "select distinct COLUMN_NAME from INFORMATION_SCHEMA.KEY_COLUMN_USAGE " + "where TABLE_NAME='" + table + "' and CONSTRAINT_NAME like 'PK_%'"; ^ space removed here </code></pre> <p>And while you are at it, remove the string concatenation and use a parameterized query.....</p> <pre><code>string sql = "select distinct COLUMN_NAME from INFORMATION_SCHEMA.KEY_COLUMN_USAGE " + "where TABLE_NAME=@tName and CONSTRAINT_NAME like 'PK_%'"; SqlCommand cmd_server2 = new SqlCommand(sql, connection); connection.Open(); cmd_server2.Parameters.AddWithValue("@tName", table); </code></pre>
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    1. POUsing stream reader to catch values returned by sql statemtnt c#
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    1. USSteve
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      1. VTUpMod
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    1. COthe program exits after the reader_sql = cmd_server2.ExecuteReader(); line.
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      1. USAnoushka Seechurn
    2. COAre you sure there is a Primary Key in your table? And the name begins with the letters 'PK'?
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      1. USSteve
    3. COYes, i tested the sql on the sql studio it returns 2 names.
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      1. USAnoushka Seechurn
 

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