Populate a datagridview with sql query results

Question

I\'m trying to present query results, but I keep getting a blank data grid. It\'s like the data itself is not visible

Here is my code:

 private void         


        

Answer 1

String strConnection = Properties.Settings.Default.BooksConnectionString;
SqlConnection con = new SqlConnection(strConnection);

SqlCommand sqlCmd = new SqlCommand();
sqlCmd.Connection = con;
sqlCmd.CommandType = CommandType.Text;
sqlCmd.CommandText = "Select * from titles";
SqlDataAdapter sqlDataAdap = new SqlDataAdapter(sqlCmd);

DataTable dtRecord = new DataTable();
sqlDataAdap.Fill(dtRecord);
dataGridView1.DataSource = dtRecord;

Answer 2

You may get a blank data grid if you set the data Source to a Dataset that you added to the form but is not being used. Set this to None if you are programatically setting your dataSource based on the above codes.

Answer 3

Here's your code fixed up. Next forget bindingsource

 var select = "SELECT * FROM tblEmployee";
 var c = new SqlConnection(yourConnectionString); // Your Connection String here
 var dataAdapter = new SqlDataAdapter(select, c); 

 var commandBuilder = new SqlCommandBuilder(dataAdapter);
 var ds = new DataSet();
 dataAdapter.Fill(ds);
 dataGridView1.ReadOnly = true; 
 dataGridView1.DataSource = ds.Tables[0];

Answer 4

you have to add the property Tables to the DataGridView Data Source

 dataGridView1.DataSource = table.Tables[0];

Answer 5

You may try this sample, and always check your Connection String, you can use this example with or with out bindingsource you can load the data to datagridview.

private void Employee_Report_Load(object sender, EventArgs e)
{
        var table = new DataTable();

        var connection = "ConnectionString";

        using (var con = new SqlConnection { ConnectionString = connection })
        {
            using (var command = new SqlCommand { Connection = con })
            {

                if (con.State == ConnectionState.Open)
                {
                    con.Close();
                }

                con.Open();

                try
                {
                    command.CommandText = @"SELECT * FROM tblEmployee";
                    table.Load(command.ExecuteReader());

                    bindingSource1.DataSource = table;

                    dataGridView1.ReadOnly = true;
                    dataGridView1.DataSource = bindingSource1;

                }
                catch(SqlException ex)
                {
                    MessageBox.Show(ex.Message + " sql query error.");
                }

            }

        }

 }

Answer 6

Try binding your DataGridView to the DefaultView of the DataTable:

dataGridView1.DataSource = table.DefaultView;