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csharp
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using System;
using Amazon;
using Amazon.RDS;
using Amazon.RDS.Model;

public async Task<string> CreateRDSInstance()
{
    // Configure the AWS region and credentials
    var region = RegionEndpoint.USWest2;
    var credentials = new Amazon.Runtime.BasicAWSCredentials("ACCESS_KEY", "SECRET_KEY");

    // Create an RDS client with the configured region and credentials
    var rdsClient = new AmazonRDSClient(credentials, region);

    // Configure the parameters for the RDS instance
    var dbInstanceIdentifier = "my-rds-instance";
    var dbInstanceClass = "db.t2.micro";
    var engine = "sqlserver-se";
    var engineVersion = "15.00.4073.23.v1";
    var masterUsername = "admin";
    var masterPassword = "mypassword";
    var dbName = "mydatabase";
    var vpcSecurityGroupId = "sg-0123456789abcdef";
    var subnetGroupName = "my-subnet-group";

    // Check if the RDS instance has capacity for a new database
    var describeRequest = new DescribeDBInstancesRequest
    {
        DBInstanceIdentifier = dbInstanceIdentifier
    };
    var describeResponse = await rdsClient.DescribeDBInstancesAsync(describeRequest);
    var dbInstance = describeResponse.DBInstances.FirstOrDefault();
    if (dbInstance == null)
    {
        throw new Exception($"RDS instance {dbInstanceIdentifier} not found");
    }
    if (dbInstance.DBInstanceStatus != "available")
    {
        throw new Exception($"RDS instance {dbInstanceIdentifier} is not available");
    }
    if (dbInstance.DBInstanceClass != dbInstanceClass)
    {
        throw new Exception($"RDS instance {dbInstanceIdentifier} has a different instance class");
    }
    if (dbInstance.DBInstanceAllocatedStorage >= 100)
    {
        throw new Exception($"RDS instance {dbInstanceIdentifier} has reached the maximum storage capacity");
    }

    // Create the request to create an RDS instance
    var createRequest = new CreateDBInstanceRequest
    {
        DBInstanceIdentifier = dbInstanceIdentifier,
        DBInstanceClass = dbInstanceClass,
        Engine = engine,
        EngineVersion = engineVersion,
        MasterUsername = masterUsername,
        MasterUserPassword = masterPassword,
        DBName = dbName,
        VpcSecurityGroupIds = new List<string> { vpcSecurityGroupId },
        DBSubnetGroupName = subnetGroupName
    };

    // Create the RDS instance
    var response = await rdsClient.CreateDBInstanceAsync(createRequest);

    // Return the endpoint of the created RDS instance
    return response.DBInstance.Endpoint.Address;
}
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