How to assign a value to a variable in datareader

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I have a table 'clientinfo'. In this 'CartTxNo' is a column with int datatype.
I want to assign its value value to a variable 'v_CartTxno1'. I get the error: 'Invalid attempt to read when no data is present' at line ' int v_CartTxNo1 = reader.GetInt32(0);'
How to rectify my code?

SqlCommand cmd = new SqlCommand("select CartTxNo from clientinfo where ClientPhone= '" + v_MobileNo + "'", con);
SqlParameter param = new SqlParameter();
param.ParameterName = "@v_mem_id1";
param.Value = TextBox1.Text;
cmd.Parameters.Add(param);
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
if (reader.HasRows)
{
int v_CartTxNo1 = reader.GetInt32(0);

Posted 2-Jan-14 18:06pm

S.Rajendran from Coimbatore

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Abhinav S · Accepted Answer · 2014-01-02T18:07:00

Solution 1

You need to start reading the reader first.

For e.g.

if (reader.HasRows)
{
  while (reader.Read())
  {
    int v_CartTxNo1 = reader.GetInt32(0);
    break; 
  }
}

Posted 2-Jan-14 18:07pm

Abhinav S

Updated 2-Jan-14 18:08pm

v3