This tutorial will teach you how to Populate DataGridView based on Combobox selected using C#.net and Microsoft SqlServer.
Import the Namespace
using System.Data.SqlClient;
Establish the database Connection
SqlConnection con = new SqlConnection("server=.;database=ads;user id=sa;password=123;"); SqlCommand cmd; SqlDataAdapter dr; DataSet ds;
if (comboBox1.SelectedItem.ToString() == "Students") { try { dataGridView1.Refresh(); con.Open(); DataTable dt = new DataTable(); dr = new SqlDataAdapter("select * from student", con); dr.Fill(dt); dataGridView1.DataSource = dt; con.Close(); } catch (Exception ex) { MessageBox.Show(ex.Message); } } else if (comboBox1.SelectedItem.ToString() == "Courses") { try { dataGridView1.Refresh(); con.Open(); DataTable dt = new DataTable(); dr = new SqlDataAdapter("select * from course", con); dr.Fill(dt); dataGridView1.DataSource = dt; con.Close(); } catch (Exception ex) { MessageBox.Show(ex.Message); } }
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