Can't write string from table to string attribute in C#

I read values from an local Access mdb-file. One value is stored as string in the db and I have it in a table. When using the GetType() method it return "System.String" and I can print it on the console without a problem but when I want to use it as an attribute for another method (requires a string) I get an error ("Cannot convert from 'object' to开发者_StackOverflow社区 'string'" and the same for 'int'). The same problems occur with some int values.

Am I doing something wrong or what is the problem in that case?

Console.WriteLine(dt.Rows[0][ProjName]); //prints project_name
Console.WriteLine(dt.Rows[0][ProjName].GetType()); //print "System.String"

Project = new Project(dt.Rows[0][ProjName], dt.Rows[0][MinDay], dt.Rows[0][MinWeek], dt.Rows[0][DayWeek]); //Error
Project = new Project(Convert.ToString(dt.Rows[0][ProjName]), Convert.ToInt32(dt.Rows[0][MinDay]), Convert.ToInt32(dt.Rows[0][MinWeek]), Convert.ToInt32(dt.Rows[0][DayWeek])); //Works Fine

Constructor for the Project Class:

public Project(string projectName, int hoursPerDay, int hoursPerWeek, int daysPerWeek)

You have stated in your answer is works when converting, and it is necessary as they are not strings and integers. They are objects. You can create a methid to handle it if you want.

public Project CreateProject(object projectName, object hoursPerDay, object hoursPerWeek, object daysPerWeek)
{
    return new Project(projectName.ToString(), Convert.ToInt32(hoursPerDay), Convert.ToInt32(hoursPerWeek), Convert.ToInt32(daysPerWeek);
}

You have to explicitly cast the objects:

To cast to string use:

Object.ToString();

To cast to integers use:

Int32.TryParse(String, out int);

Your constuctor becomes

Project = new Project(dt.Rows[0][ProjName].ToString(), Int32.Parse(dt.Rows[0][MinDay]), Int32.Parse(dt.Rows[0][MinWeek]), Int32.Parse(dt.Rows[0][DayWeek]));

Note: Using Int32.Parse instead of Int32.TryParse assumes that the argument provided is a valid int at all times and does not give you a way to check if the casting has succeeded.

dt.Rows[0][ProjName] returns type object, and your method expects string. Even though you know it to be a string, it is not obvious to the compiler and must be specified explicitly using a cast, as you show in your last example, although just casting should be more efficient than converting unnecessarily:

Project = new Project((string)dt.Rows[0][ProjName], ...