How to fetch data from database in C#

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I have created a database in sql in which I have provided a unique id to every entry and I want to fetch the entire data in C# using that unique id. Help me ~~asap~~.

Edit - OP code from comment

C#

private void button1_Click_1(object sender, EventArgs e)
{
	SqlConnection con = new SqlConnection("Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=sales;Data Source=MERITECH-PC");
	con.Open();

	SqlCommand cmd = new SqlCommand("Select * from new", con);
	cmd.Parameters.Add("@id", SqlDbType.Int).Value = 1;
	  
	SqlDataReader dr = cmd.ExecuteReader();
	if (dr.HasRows)
	{
		dr.Read();
		txt1.Text= dr[0].ToString();
		txt2.Text = dr[1].ToString();
		txt3.Text = dr[2].ToString();
		txt4.Text = dr[3].ToString();
		txt5.Text = dr[4].ToString();
	}
	con.Close();
}

Posted 19-Feb-15 1:13am

Member 11154071

Updated 19-Feb-15 22:37pm

Vladimir Svyatski

v4

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Comments

CHill60 19-Feb-15 7:20am

What have you tried and where are you stuck?

Member 11154071 20-Feb-15 0:02am

private void button1_Click_1(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection("Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=sales;Data Source=MERITECH-PC");
con.Open();

SqlCommand cmd = new SqlCommand("Select * from new", con);
cmd.Parameters.Add("@id", SqlDbType.Int).Value = 1;

SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
dr.Read();
txt1.Text= dr[0].ToString();
txt2.Text = dr[1].ToString();
txt3.Text = dr[2].ToString();
txt4.Text = dr[3].ToString();
txt5.Text = dr[4].ToString();
}
con.Close();

CHill60 20-Feb-15 4:23am

That's not XAML.
All that is missing from your query is the WHERE clause - where do you store the id you want to search on ?

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Vladimir Svyatski · Answer 1 · 2015-02-19T22:42:00

Here is your code (assuming your primary key is named id):

C#

private void button1_Click_1(object sender, EventArgs e)
{
	SqlConnection con = new SqlConnection("Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=sales;Data Source=MERITECH-PC");
	con.Open();
 
	//notice the addition below
    SqlCommand cmd = new SqlCommand("Select * from new where id=@id", con);
	cmd.Parameters.Add("@id", SqlDbType.Int).Value = 1;
	  
	SqlDataReader dr = cmd.ExecuteReader();
	if (dr.HasRows)
	{
		dr.Read();
		txt1.Text= dr[0].ToString();
		txt2.Text = dr[1].ToString();
		txt3.Text = dr[2].ToString();
		txt4.Text = dr[3].ToString();
		txt5.Text = dr[4].ToString();
	}
	con.Close();
}