Welcome to the Csharp-codes repository! This is a comprehensive collection of C# code snippets, examples, and projects to enhance your understanding and mastery of C# programming.
C# is a powerful and versatile programming language used for building a wide range of applications, from desktop to web and mobile. This repository is designed to serve as a valuable resource for developers of all skill levels, offering practical examples and projects covering various C# concepts.
To begin exploring the Csharp-codes repository, follow these steps:
-
Clone the repository to your local machine using the following command:
git clone https://github.com/bhargavtz/Csharp-codes.git
-
Ensure you have Visual Studio or another C# development environment installed.
-
Navigate through the folders to discover code snippets, projects, and tutorials.
The code-snippets directory contains short and focused code snippets, each highlighting a specific C# feature or concept. These snippets are perfect for quick reference and learning.
Explore the projects directory to find larger C# projects. These projects showcase the implementation of more complex applications, allowing you to delve into real-world scenarios.
The tutorials directory offers step-by-step guides on various C# topics. These tutorials provide in-depth explanations and hands-on exercises to deepen your understanding.
- Create a console application in C# to print a message “Welcome To C#.NET”.
using System;
namespace MyApp
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Welcome To C#.NET");
}
}
}- form 1.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace WindowsFormsApplication2
{
public partial class Form3 : Form
{
SqlConnection con = new SqlConnection("Data Source=DESKTOP-4R9OKP6;Initial Catalog=newsql;Integrated Security=True");
public Form3()
{
InitializeComponent();
}
private void Form3_Load(object sender, EventArgs e)
{
viewCity();
viewdetails();
}
private void viewCity()
{
//throw new NotImplementedException();
SqlDataAdapter ad;
DataTable dt = new DataTable();
con.Close();
ad = new SqlDataAdapter("select cname from tbl_c;", con);
con.Open();
ad.Fill(dt);
con.Close();
combocity.ValueMember = "cin";
combocity.DisplayMember = "cname";
combocity.DataSource = dt;
}
private void viewdetails()
{
//throw new NotImplementedException();
SqlDataAdapter ad;
DataTable dt = new DataTable();
con.Close();
ad = new SqlDataAdapter(" select * from tbl_e ", con);
con.Open();
ad.Fill(dt);
con.Close();
dataGridView1.DataSource = dt;
}
public string gender()
{
if (rm.Checked)
{
return "M";
}
else if (rf.Checked)
{
return "F";
}
else // No radio button selected
{
return ""; // Or throw an exception if gender selection is mandatory
}
}
private void btninsert_Click(object sender, EventArgs e)
{
int city;
city = Convert.ToInt32(combocity.SelectedIndex);
city += 1;
SqlCommand cmd;
con.Close();
cmd = new SqlCommand("insert into tbl_e values ('"+txtname.Text+"','"+gender()+"',"+city+");", con);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("Record inserted successfully!");
viewCity();
viewdetails();
}
}
}- form 3.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace WindowsFormsApplication2
{
public partial class Form2 : Form
{
SqlConnection con= new SqlConnection("Data Source=DESKTOP-4R9OKP6;Initial Catalog=Aelis;Integrated Security=True");
public Form2()
{
InitializeComponent();
}
private void Form2_Load(object sender, EventArgs e)
{
viewCity();
viewdetails();
}
private void viewCity()
{
//throw new NotImplementedException();
SqlDataAdapter ad;
DataTable dt = new DataTable();
con.Close();
ad = new SqlDataAdapter("select distinct cname from tblcity;", con);
con.Open();
ad.Fill(dt);
con.Close();
combocity.ValueMember = "cid";
combocity.DisplayMember = "cname";
combocity.DataSource = dt;
}
private void cll() {
txtfname.Clear();
txtenro.Clear();
txtcontact.Clear();
txtlname.Clear();
txtcity.Clear();
}
private void btninsert_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtfname.Text) || string.IsNullOrWhiteSpace(txtlname.Text) || string.IsNullOrWhiteSpace(txtcontact.Text))
{
MessageBox.Show("Please enter all details before inserting.");
return;
}
try
{
SqlCommand cmd;
con.Close();
cmd = new SqlCommand("insert into tbl values ('" + txtfname.Text + "','" + txtlname.Text + "'," + txtcontact.Text + ",'"+txtcity.Text+"')", con);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("Record inserted successfully!");
cll();
viewCity();
viewdetails();
}
catch (SqlException ex)
{
MessageBox.Show("An error occurred while inserting the record: " + ex.Message);
}
}
public void viewdetails() {
SqlDataAdapter ad ;
DataTable dt = new DataTable();
con.Close();
ad = new SqlDataAdapter(" select * from tbl_stud ",con);
con.Open();
ad.Fill(dt);
con.Close();
dataGridView1.DataSource = dt;
}
private void btnview_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtenro.Text))
{
MessageBox.Show("Please enter Enrollment Number.");
return;
}
try
{
con.Close();
SqlCommand cmd;
cmd = new SqlCommand("select * from tbl_stud where Enrollmentno = " + txtenro.Text + ";", con);
SqlDataReader dr;
con.Open();
dr = cmd.ExecuteReader();
if (dr.HasRows)
{
dr.Read();
txtfname.Text = dr.GetValue(1).ToString();
txtlname.Text = dr.GetValue(2).ToString();
txtcontact.Text = dr.GetValue(3).ToString();
txtcity.Text = dr.GetValue(4).ToString();
}
else
{
MessageBox.Show("Data is not available for the entered Enrollment Number.");
txtfname.Clear();
txtlname.Clear();
txtcontact.Clear();
txtcity.Clear();
}
dr.Close();
con.Close();
}
catch (SqlException ex)
{
MessageBox.Show("An error occurred while retrieving the record: " + ex.Message);
}
}
private void btnupdate_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtenro.Text) || string.IsNullOrWhiteSpace(txtfname.Text) || string.IsNullOrWhiteSpace(txtlname.Text) || string.IsNullOrWhiteSpace(txtcontact.Text) || string.IsNullOrWhiteSpace(txtcity.Text))
{
MessageBox.Show("Please enter all details before updating.");
return;
}
try
{
SqlCommand cmd;
con.Close();
cmd = new SqlCommand("update tbl_stud set Firstname ='" + txtfname.Text + "', Lastname = '" + txtlname.Text + "', Contactno = " + txtcontact.Text + ",City ='"+txtcity.Text+"' where Enrollmentno = " + txtenro.Text + ";", con);
con.Open();
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("Record updated successfully!");
cll();
viewCity();
viewdetails();
}
catch (SqlException ex)
{
MessageBox.Show("An error occurred while updating the record: " + ex.Message);
}
}
private void btndelet_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtenro.Text))
{
MessageBox.Show("Please enter Enrollment Number.");
return;
}
try
{
SqlCommand cmd;
con.Close();
cmd = new SqlCommand("delete from tbl_stud where Enrollmentno = " + txtenro.Text + ";", con);
con.Open();
int rowsAffected = cmd.ExecuteNonQuery();
con.Close();
if (rowsAffected > 0)
{
MessageBox.Show("Record Deleted successfully!");
cll();
viewCity();
viewdetails();
}
else
{
MessageBox.Show("No record found for the entered Enrollment Number.");
}
}
catch (SqlException ex)
{
MessageBox.Show("An error occurred while deleting the record: " + ex.Message);
}
}
private void btnsearch_Click(object sender, EventArgs e)
{
txtenro.Enabled = true;
viewCity();
viewdetails();
}
private void btnRecord_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtenro.Text))
{
MessageBox.Show("Please enter Enrollment Number.");
return;
}
try
{
SqlCommand cmd;
con.Close();
cmd = new SqlCommand("select * from tbl_stud where Enrollmentno = " + txtenro.Text + ";", con);
con.Open();
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
adapter.Fill(dt);
if (dt.Rows.Count > 0)
{
dataGridView1.DataSource = dt;
}
else
{
MessageBox.Show("Record not found for the entered Enrollment Number.");
dataGridView1.DataSource = null;
}
con.Close();
}
catch (SqlException ex)
{
MessageBox.Show("An error occurred while retrieving the record: " + ex.Message);
}
}
private void combocity_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedCity = combocity.Text;
SqlDataAdapter ad;
DataTable dt = new DataTable();
con.Close();
ad = new SqlDataAdapter("select * from tbl_stud where City = '" + selectedCity + "';", con);
con.Open();
ad.Fill(dt);
con.Close();
//DataView dv = new DataView(dt);
// dv.ro
dataGridView1.DataSource = dt;
}
}
}- form3 .
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnFOnt_Click(object sender, EventArgs e)
{
if(fontDialog1.ShowDialog() == DialogResult.OK){
richTextBox1.Font = fontDialog1.Font;
}
}
private void btncolor_Click(object sender, EventArgs e)
{
if(colorDialog1.ShowDialog() == DialogResult.OK){
richTextBox1.ForeColor = colorDialog1.Color;
}
}
private void btnleft_Click(object sender, EventArgs e)
{
richTextBox1.SelectionAlignment = HorizontalAlignment.Left;
}
private void btncenter_Click(object sender, EventArgs e)
{
richTextBox1.SelectionAlignment = HorizontalAlignment.Center;
}
private void btnright_Click(object sender, EventArgs e)
{
richTextBox1.SelectionAlignment = HorizontalAlignment.Right;
}
private void btnbold_Click(object sender, EventArgs e)
{
richTextBox1.Font = new Font(richTextBox1.Font, richTextBox1.Font.Style ^ FontStyle.Bold);
}
private void btnitalic_Click(object sender, EventArgs e)
{
richTextBox1.Font = new Font(richTextBox1.Font, richTextBox1.Font.Style ^ FontStyle.Italic);
}
private void btnunderline_Click(object sender, EventArgs e)
{
richTextBox1.Font = new Font(richTextBox1.Font, richTextBox1.Font.Style ^ FontStyle.Underline);
}
}
}
We welcome contributions to enhance the content and breadth of this repository. To contribute:
- Fork the repository.
- Create a new branch for your feature or bug fix.
- Make your changes and commit them.
- Push your changes to your fork.
- Create a pull request to the
mainbranch of the original repository.
Please adhere to the Code of Conduct and the Contribution Guidelines.
Your feedback is essential! If you have suggestions, find bugs, or want to request specific content, please open an issue.
This project is licensed under the MIT License. Feel free to use the code in this repository for your own projects.
Happy coding!