how to know if exist database using sqlSugar.DbMaintenance and c#?

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You can use the DbMaintenance class in SqlSugar to check if a database exists before attempting to create or manipulate it. The DbMaintenance class provides a method called IsAnyDatabaseExist that you can use for this purpose. Here's an example of how to use it in C#:
using SqlSugar;

// Connect to the database server
var db = new SqlSugarClient("connection string");

// Check if the database exists
var exists = db.DbMaintenance.IsAnyDatabaseExist("database name");

// If the database does not exist, create it
if (!exists)
{
    db.DbMaintenance.CreateDatabase("database name");
}
In this example, "connection string" is the connection string for your database server, and "database name" is the name of the database you want to check. If the database exists, exists will be true, and if it does not exist, exists will be false. You can then use this information to create the database if it does not exist.