无效的列名“ textBox.Text”

Question

I'm using Sql for the first time. I have a visual C# project and a form filled with text boxes. When I try to get the information form first and second text box to make a new save in the table, I recieve an error 'Invalid column name 'value from first text box.'' . Here is the code I think will be needed to help me:

SqlConnection connection = new SqlConnection(global::DiplomaAssignment.Properties.Settings.Default.Database1ConnectionString);
 string sql = "INSERT INTO StudentsTable (First_name,Second_name) values (" + textBox1.Text + ",'" + textBox2.Text + "')";
            SqlCommand executeSql = new SqlCommand(sql, connection);
            connection.Open();
            executeSql.ExecuteNonQuery();
connection.Close(); 

I think the problem is in the sql string syntax, but as I mentioned before I'm new and can't understand the displayed error.

Answer 1

I have modified your sql a bit here. I think its better to use string.format instead gluing sting together. See if following works:

string sql = "INSERT INTO StudentsTable (First_name,Second_name) values (string.format("{0},{1}",textbox1.text.trim(),textbox2.text.trim()))";

Note that there could be syntax error.

Answer 2

Try this ...

string sql = "INSERT INTO StudentsTable (First_name,Second_name) values ('" + textBox1.Text + "','" + textBox2.Text + "')";
                                                                         ^                     ^ missing single quotes

Answer 3

You missed to put textBox1.Text in single qoutes.

string sql = "INSERT INTO StudentsTable (First_name,Second_name) values ('" + textBox1.Text + "','" + textBox2.Text + "')"

It should work this way.