inserting textbox values into database

Question

im a newbie here and would like some advice on C# programming

i would like to store values from a textbox into a database. so far, i have the following:

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Answer 1

At least your code should look like this:

void SaveData(string projectName, DateTime biddingDueDate, string status, DateTime projectStartDate, string assignedTo, int pointsWorth, string staffCredits)
{
    try
    {
        string connectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Customers.mdf;Integrated Security=True;User Instance=True";
        using (SqlConnection connection = new SqlConnection(connectionString))
        using (SqlCommand command = connection.CreateCommand())
        {
            command.CommandText = "INSERT INTO ProjectList (ProjectName, BiddingDueDate, Status, ProjectStartDate, ProjectEndDate, AssignedTo, PointsWorth, StaffCredits) VALUES (@projectName, @biddingDueDate, @status, @projectStartDate, @projectStartDate, @assignedTo, @pointsWorth, @staffCredits)";

            command.Parameters.AddWithValue("@projectName", projectName);
            command.Parameters.AddWithValue("@biddingDueDate", biddingDueDate);
            command.Parameters.AddWithValue("@status", status);
            command.Parameters.AddWithValue("@projectStartDate", projectStartDate);
            command.Parameters.AddWithValue("@assignedTo", assignedTo);
            command.Parameters.AddWithValue("@pointsWorth", pointsWorth);
            command.Parameters.AddWithValue("@staffCredits", staffCredits);

            connection.Open();
            command.ExecuteNonQuery();
        }
    }
    catch (SqlException ex)
    {
        Console.WriteLine(ex.Message);
    }

}

Parameter's type can be determined (tried to be) automatically:

command.Parameters.AddWithValue("@biddingDueDate", biddingDueDate);

or specified manually:

command.Parameters.Add("@biddingDueDate", System.Data.SqlDbType.DateTime).Value = biddingDueDate;

also you can convert date to string with specified format to minimize the risk of mistaken parsing (because of culture dependent specificity, etc) on database side:

command.Parameters.Add("@biddingDueDate", System.Data.SqlDbType.DateTime).Value = biddingDueDate.ToString("yyyy-MM-dd"); // also you can use just yyyyMMdd