Filtering DataGridView with TextBox (C#)

Question

I'm trying to filter my dgv (via database), by using a textbox.

The problem I run into, is that when I enter a valid item name into the textbox, I get an error that tells me that I didn't enter a valid column name into the textbox...which is weird...because I'm pretty sure I have it looking for items by name, and not looking for columns:/

Here is my code:

     private void button3_Click(object sender, EventArgs e)
        {
        //CLEAR CURRENT DATA IN DGV
        datagridview1.Rows.Clear();
        datagridview1.Refresh();

        Connection();
        sqlconnection.Open();

        using (sqlcmd = new SqlCommand("SELECT * FROM inventory_table WHERE Item= " + searchbox.Text, sqlconnection))
        {
           using (SqlDataReader sqldr = sqlcmd.ExecuteReader())
           {
                while (sqldr.Read())
                {
                    datagridview1.Rows.Add(new object[]{
                    sqldr.GetValue(sqldr.GetOrdinal("Item")),
                    sqldr.GetValue(sqldr.GetOrdinal("Quantity")),
                    sqldr.GetValue(sqldr.GetOrdinal("id")),
                });
                }

                sqldr.Close();
            }
        }
        sqlconnection.Close();
    }

How do I fix this?

Answer 1

It is possible you are referencing the wrong column name in your SQL reads:

sqldr.GetValue(sqldr.GetOrdinal("id")), // Check that "id" and other columns are correct.

Double check the spelling and capitalization of those column references with what is in your database.