数据库System.Data.SqlClient.SqlException

Question

I'm trying to use database:

 SqlConnection sqlcon = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=D:\DB\LogiDB.mdf;Integrated Security=True;Connect Timeout=30");
            string query = "Select * from tbl_Login Where username = '" + textBox1.Text.Trim().ToLower() + "' and password = '" + textBox1.Text.Trim().ToLower() + "'";
            SqlDataAdapter sda = new SqlDataAdapter(query, sqlcon);
            DataTable dtbl = new DataTable();
            sda.Fill(dtbl);
            if (dtbl.Rows.Count == 1)
            {
               //
            }

my files is:

dbo.Table.sql
LogiDB.mdf
LogiDB_log.ldf   
tbl_Login.sql    

not sure what I'm doing wrong but when I press to button I got this with line sda.Fill(dtbl); :

An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll

Additional information: Invalid object name 'tbl_Login'.

Answer 1

Here is my code work perfectly, You can try this and compare your code

SqlConnection cn = new SqlConnection("Data Source=AVREST\\SQLEXPRESS;Initial Catalog=master;Integrated Security=True");
            cn.Open();
            SqlCommand cmd = new SqlCommand("select loginID,loginPassword from logintavle where loginID='" + textBox1.Text + "'and loginPassword='" + textBox2.Text + "'", cn);
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            //sda.SelectCommand = cmd;
            DataTable dataset = new DataTable();
            sda.Fill(dataset);
            if (dataset.Rows.Count > 0)

Answer 2

As the error says: Invalid object name 'tbl_Login'

This might mean:

• tbl_Login table doesn't exist in you database
• you are connecting to wrong database

Since you have tbl_Login.sql script, I guess it contains table definition. Therefore you would need to run script to create table in your LogiDB database.

Here there is example how to connect to local database