Please explain me what coding I use ...when nameofemployee is selected from dropdownlist then his salary is shown in the textbox automatically which is non editable?

Question

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There is table Employee which contains Name,Salary,Address,....
Now, When I select Name of Employee in dropdownlist then I want to show his Salary Automatically in Textbox...
How I do this..
Please give me solution...

Sorry For All yours inconvenience..

What I have tried:

C#

public partial class Maintanance : System.Web.UI.Page
{
    SqlConnection cn;
    SqlCommand cmd;
    SqlDataReader rd;
    Int32 value;

    protected void Page_Load(object sender, EventArgs e)
    {
        cn= new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=MyDB;Integrated Security=True;Pooling=False");
    }
    protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
        if(DropDownList1.SelectedIndex!=0)
        {
            
            cmd = new SqlCommand("Select Salary from Employees where Empname='"+DropDownList1.SelectedValue.ToString()+"'", cn);
            cn.Open();
            value =(Int32)cmd.ExecuteScalar();
            cn.Close();
            TextBox1.Text = value;

        }
    }

    }

Name - DropDownlist Here (When Name of Employee is Selected)
Available Leaves - Textbox here (I want to show his salary automatically in textbox)

Posted 10-May-16 2:20am

Member 12305778

Updated 17-May-16 6:51am

v8

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Comments

Sergey Alexandrovich Kryukov 10-May-16 8:43am

Not clear? What's the problem? What do you want to achieve?
—SA

Karthik_Mahalingam 10-May-16 8:45am

question not clear, Provide more information by clicking Imporve question

Patrice T 10-May-16 15:38pm

What is the problem ?
Keep in mind that we don't know what you talk about, give proper explanations. Your question is actually unclear.
Use Improve question to update your question.

Richard Deeming 17-May-16 8:54am

Your code is vulnerable to SQL Injection[^]. NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
Query Parameterization Cheat Sheet | OWASP[^]

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George Jonsson · Answer 1 · 2016-05-17T06:51:00

I'm not sure why you use the TextBox.TextChanged event. Shouldn't you use the ListControl.SelectedIndexChanged Event (System.Web.UI.WebControls)[^]?

And as Richard Deeming said in the comment, use a parameterized query instead.

C#

private string connectionString = ???;

void DropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
    if (DropDownList1.SelectedIndex > -1)
    {
        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            SqlCommand cmd = new SqlCommand("SELECT Salary FROM Employees WHERE Empname = @empName", conn);
            
            cmd.Parameters.AddWithValue("@empName", DropDownList1.SelectedValue.ToString());

            conn.Open();
            int value = (int)cmd.ExecuteScalar();
            TextBox1.Text = value.ToString();
        } // The connection automatically closed here because Dispose is called
    }
}