What is the exact text of the exception that you catch when you execute
the delete operation?

Peer code review time:

>     connectionString = "Provider=SQLOLEDB;Data
> Source=Ravi;Initial Catalog=Master;" +
>      "Integrated Security=SSPI;";
>    }
> 
>    OleDbConnection connection = new OleDbConnection
> (connectionString);

If your code will always be executing against SQL Server, and only SQL
Server, then consider using the SQL Server Managed Provider classes
(SqlCommand, SqlConnection, et al) for better performance.

>    String StrCreateDb = "Create Database
> ["+textBox1.Text+"]";

Consider using StringBuilder to concatenate strings for better
performance:

System.Text.StringBuilder createDB = new System.Text.StringBuilder();
createDB.AppendFormat("CREATE DATABASE [{0}]", textBox1.Text);
string StrCreateDb = createDB.ToString();

>    for(int x=0; x<=200000;x++)
>    {
>    }

Huh?

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