Question

I want to show next record by clicking a button. Here’s my code

private DataTable GetData()
        {
            DataTable dt = new DataTable();

            SqlConnection connection = new SqlConnection(connectionString);
            try
            {
                connection.Open();
                SqlCommand sqlCmd = new SqlCommand("Select * From Data", connection);
                SqlDataAdapter sqlDa = new SqlDataAdapter(sqlCmd);

                sqlDa.Fill(dt);
            }
            catch (System.Data.SqlClient.SqlException ex)
            {

            }
            finally
            {
                connection.Close();
            }
            return dt;
        }


        public Form1()
        {

            DataTable dt = GetData();
            if (dt.Rows.Count > 0)
            {
                // Populate the TextBox with the first entry on page load
                txtName.Text = dt.Rows[0]["Name"].ToString();
            }
        }

but i am getting an exception on txtName.Text = dt.Rows[0][“Name”].ToString();
Object Reference is not set of an object.

Please help me

Answer 1

Add in null checks for txtName and dt.Rows[0]["Name"]:

if (dt.Rows.Count > 0 && txtName != null && dt.Rows[0]["Name"] != null) 
{
    txtName.Text = dt.Rows[0]["Name"].ToString(); 
} 

If dt.Rows[0]["Name"] is null, it is null in the Database. If that is not expected, debug your database insertion code.

If txtName is null, it is because you are executing this code before txtName has been initialized. Make sure your code does not execute until after txtName has been initialized.