nothing data selected from the database

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Dear All,

i want to select the data from database in a textbox area but its nothing select and show me my exception what is wrong in my code please tell me. i want to creates it with enter event so how it is possible.

i m using this code.

C#

  private void txtPriceGold_Enter(object sender, EventArgs e)
        {
            string connstr = @"Server=.\SQLEXPRESS ;Initial Catalog=ABJDATABASE;Integrated Security=True; Max Pool Size=100";
            string strSql = "select txtPriceGold from PriceTable Where txtPriceGold=@txtPriceGold";
            SqlConnection conn = new SqlConnection(connstr);

            try
            {
                conn.Open();
                SqlCommand objCommand = new SqlCommand(strSql, conn);
                using (SqlDataReader dr = objCommand.ExecuteReader())
                {
                    bool success = dr.Read();
                    if (success)
                    {
                        txtPriceGold.Text = dr.GetString(0);
                    }
                }

                conn.Close();
            }
            catch (Exception)
            {
                MessageBox.Show("error");
            }
}

Posted 1-Sep-13 16:48pm

Manish Arya

Updated 1-Sep-13 18:08pm

Sushil Mate

v2

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ArunRajendra · Accepted Answer · 2013-09-01T17:18:00

Solution 1

Change this line to

C#

string strSql = "select txtPriceGold from PriceTable Where txtPriceGold=@txtPriceGold";

C#

string strSql = "select txtPriceGold from PriceTable Where txtPriceGold='"+txtPriceGold +"'";

If you want to use @txtPriceGold then pass the value for the parameter.

Posted 1-Sep-13 17:18pm

ArunRajendra

Comments

Manish Arya 2-Sep-13 0:37am

same problem

ArunRajendra 2-Sep-13 0:51am

Can you post your modified code?

Manish Arya 2-Sep-13 1:12am

private void txtPriceGold_Enter(object sender, EventArgs e)
{
string connstr = @"Server=.\SQLEXPRESS ;Initial Catalog=RPSJDB;Integrated Security=True; Max Pool Size=100";
string strSql = "select txtPriceGold from PriceTable Where txtPriceGold='" + txtPriceGold + "'";

SqlConnection conn = new SqlConnection(connstr);

try
{
conn.Open();
SqlCommand objCommand = new SqlCommand(strSql, conn);
using (SqlDataReader dr = objCommand.ExecuteReader())
{
bool success = dr.Read();
if (success)
{
txtPriceGold.Text = dr.GetString(1);
}
}

conn.Close();
}
catch (Exception)
{
MessageBox.Show("error");
}

ArunRajendra 2-Sep-13 1:22am

Try this
string strSql = "select txtPriceGold from PriceTable Where txtPriceGold='" + txtPriceGold.Text + "'";

If you get the error then post the error.

Manish Arya 2-Sep-13 2:10am

private void txtPriceGold_Enter(object sender, EventArgs e)
{
string connstr = @"Server=.\SQLEXPRESS ;Initial Catalog=RPSJDB;Integrated Security=True; Max Pool Size=100";
string strSql = "select txtPriceGold from PriceTable Where txtPriceGold='" + txtPriceGold.Text + "'";

SqlConnection conn = new SqlConnection(connstr);
conn.Open();
SqlCommand objCommand = new SqlCommand(strSql, conn);
using (SqlDataReader dr = objCommand.ExecuteReader())
{
bool success = dr.Read();
if (success)
{
txtPriceGold.Text = dr.GetString(1);
}
}
conn.Close();

error is
"Error converting data type varchar to numeric."

ArunRajendra 2-Sep-13 6:16am

try after removing the "'".

Herbisaurus 2-Sep-13 10:30am

5+!

Priyanka Bhagwat · Accepted Answer · 2013-09-01T20:45:00

Solution 3

hi Replace your Query with this

C#

string strSql = "select txtPriceGold from PriceTable Where txtPriceGold="+txtPriceGold +"";

if txtPriceGold is your Textbox Field then

C#

string strSql = "select txtPriceGold from PriceTable Where txtPriceGold="+txtPriceGold.Text+"";

Remember:
case1:when your datatype is string or varchar2
we need to pass the value with '"+ +"'i.e single Quote,then Double Quote and then +
for example

C#

"select name from Customer Where name ='"+name+"'";

case2 :when your datatype is numeric or integer
we need to pass the value with "+ +"

C#

string strSql = "select txtPriceGold from PriceTable Where txtPriceGold="+txtPriceGold +"";

Hope this helped
Happy Coding:)

Posted 1-Sep-13 20:45pm

Priyanka Bhagwat

Updated 1-Sep-13 20:50pm

v3

Comments

Manish Arya 2-Sep-13 3:26am

private void txtPriceGold_Enter(object sender, EventArgs e)
{
string connstr = @"Server=.\SQLEXPRESS ;Initial Catalog=RPSJDB;Integrated Security=True; Max Pool Size=100";
string strSql = "select txtPriceGold from PriceTable Where txtPriceGold="+ txtPriceGold.Text + "";

SqlConnection conn = new SqlConnection(connstr);
conn.Open();
SqlCommand objCommand = new SqlCommand(strSql, conn);
using (SqlDataReader dr = objCommand.ExecuteReader())
{
bool success = dr.Read();
if (success)
{
txtPriceGold.Text = dr.GetString(1);
}
}
conn.Close();

error is:

Incorrect syntax near ','.

Priyanka Bhagwat 2-Sep-13 3:55am

???can u please tell me on which line is this error??

Manish Arya 2-Sep-13 4:13am

Incorrect syntax near '='.

line is:

using (SqlDataReader dr = objCommand.ExecuteReader())

Priyanka Bhagwat 2-Sep-13 3:59am

you can also declare your connection string in Web Config file if it is an web application.so that you don't need to declare it always

Priyanka Bhagwat 2-Sep-13 4:20am

try this
using (SqlDataReader read = objCommand .ExecuteReader())
{

while(reader.Read())
{
txtPriceGold.Text = reader["txtPriceGold "].ToString();
}

Manish Arya 2-Sep-13 5:02am

private void txtPriceGold_Enter(object sender, EventArgs e)
{
string connstr = @"Server=.\SQLEXPRESS ;Initial Catalog=RPSJDB;Integrated Security=True; Max Pool Size=100";
string strSql = "select txtPriceGold from PriceTable Where txtPriceGold=" + txtPriceGold.Text + "";
SqlConnection conn = new SqlConnection(connstr);
conn.Open();
SqlCommand objCommand = new SqlCommand(strSql, conn);

using (SqlDataReader reader = objCommand .ExecuteReader())
{
while(reader.Read())
{
txtPriceGold.Text = reader["txtPriceGold "].ToString();
}
}
conn.Close();
}

Incorrect syntax near '='.

same problem.

Priyanka Bhagwat 2-Sep-13 4:20am

go through this link as well
http://www.c-sharpcorner.com/forums/thread/150572/retrieving-data-from-database-into-textbox-in-c-sharp-using-asp.aspx

Herbisaurus 2-Sep-13 10:30am

5+!