Why Does ExecuteNonQuery Fail with 'Connection Not Initialized'?

Cannot ExecuteNonQuery: Connection Not Initialized

A recurring issue arises when attempting to execute a query using ExecuteNonQuery:

ExecuteNonQuery: Connection property has not been initialized. 

Explanation

This error occurs when the Connection property of the SqlCommand object is not assigned. The Connection property establishes the connection between the SqlCommand and the database. Without an established connection, ExecuteNonQuery cannot be executed.

Solution

To resolve this issue, assign the database connection to the Connection property of the SqlCommand object:

cmd.InsertCommand.Connection = connection1;

Additionally, it is advisable to use the using statement for disposable resources like SqlConnection. This practice ensures proper resource disposal and handles connection closing:

using (var connection1 = new SqlConnection(@"Data Source=.\sqlexpress;Initial Catalog=syslog2;Integrated Security=True"))
{
    using (var cmd = new SqlDataAdapter())
    {
        using (var insertCommand = new SqlCommand("INSERT INTO Application VALUES (@EventLog, @TimeGenerated, @EventType, @SourceName, @ComputerName, @InstanceId, @Message) "))
        {
            // Assign connection
            insertCommand.Connection = connection1;
            
            // Set other properties...
            
            connection1.Open();
            // Execute query...
        }
    }
}

Optimization

To further optimize performance, avoid creating multiple connections and data adapters for each iteration in a loop. Establish the connection and data adapter once outside the loop and reuse them within the loop. This reduces the overhead of creating and closing connections multiple times.

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