Question

I am trying to create a new table in a database which has a name of checkout and a check number which ive put in {0}. But when I run the program it comes up with the error shown in the title for the “Productlist varchar(50)”

SQLiteCommand tableCreateCommand = myConnection.CreateCommand();
tableCreateCommand.CommandText = string.Format("create table Checkout{0} (ID int, Productlist varchar{0}, Date varchar {0}, Time varchar (50), Total double)");
tableCreateCommand.ExecuteNonQuery();

Answer 1

You haven’t specified any values for the placeholders in String.Format.

string.Format("create table Checkout{0} (ID int, Productlist varchar{0}, 
Date varchar {0}, Time varchar (50), Total double)",  <you need to specify  
the list of values for place holders here...>)

It should be something like this. Note the values specified from second parameter onwards. You can use a constant or some variable in place of constants shown here. The value specified after the comma will replace the placeholders in the index order. {0} will use value 123456, {1} would use 50, {2} would use 65 and {3} would use 75.

string.Format("create table Checkout{0} (ID int, Productlist varchar({1}), 
Date varchar({2}), Time varchar ({3}), Total double)", 123456, 50, 65, 75)

If you need to use the same placeholder for varchar as specified for checkout, it should be like this. I am not sure if this is your intention. Here all place holders {0} will use the same value 100.

string.Format("create table Checkout{0} (ID int, Productlist varchar({0}), 
Date varchar({0}), Time varchar (50), Total double)", 100)