Question

I have an application where I need to store a value in a column. The value is a string in the code and the column data type is nvarchar.

foreach (DataRow row in dt.Rows)
{
    //Generate a random length for randomKey range between 3 and 6 characters
    Random randKey = new Random();
    int randKeyLength = randKey.Next(3, 6);

    //calculate randomKeyString
    String randomKeyString = md5Prepare.gen_randomKeyString(randKeyLength);

    //add randomKeyString to database
    row["randomKey"] = randomKeyString;
}

When I check the database, the column “randomKey” is unchanged. What is wrong here?

Answer 1

You didn’t call any Commit methods on DataRow or DataTable.
You need the DataAdapter and DataSet to actually update database.

foreach (...)
{
    // your code here
}
DataSet dataSet = new DataSet();
dataSet.Tables.Add(dt);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.Update(dataSet);