使用SQL Server的应用程序中的SqlException

Question

Hey I just started learning to make application in C# using back-end as sql. I put some breakpoints to see that the control never comes back after executing the cntCeilInn.Open(); soon, the output window shows ' System.Data.SqlClient.SqlException ' occurred in System.Data.dll

Google tells me its not timing out or something that I couldn't understand. Some help please.

string strServerName="EXPRESSION";

using (SqlConnection cntCeilInn = new SqlConnection("Data Source=" + strServerName + ";" + "Integrated Security=YES"))
{
    SqlCommand cmdCeilInn= new SqlCommand("If exists ("+ "Select name "+ "from sys.database "+ "Where name=N'CeilInn1')"+ "DROP database CeilInn1;"+ "go"+ "create database CeilInn1;", cntCeilInn);
    cntCeilInn.Open();
    cmdCeilInn.ExecuteNonQuery();
}

Answer 1

As connectionString parameter,you should use:

Data Source=yourServerName;Initial Catalog=yourDatabaseName;Integrated Security=True

make sure to modify youServerName and yourDatabaseName by appropriate data.

Note that you forgot to set the database name in your connectionString( Initial Catalog ), and the value for Integrated Security is True .

Answer 2

There are few mistakes in your sql query .

1. It's sys.databases not sys.database

2. No space between Go and Create syntax

3. You need to place the sql statements in seperate line

4. Not to mention do check your connection string once as others have stated

Try this out

SqlCommand cmdCeilInn = new SqlCommand("If exists (" + "Select name " + "from sys.databases " + "Where name=N'Sample') DROP database Sample;" 
                      +Environment .NewLine+ "go " + Environment .NewLine 
                     +" create database Sample;", cntCeilInn);