try this.. :)
string ppo_no = "Set ppo_no value";
string billDate = "Set billdate";
string DeleteStr = "select * from Tablename where ppo_no="+ppo_no+" and convert(varchar,billdate,106)=convert(varchar,"+billDate+",106)";
SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionstringName"].ConnectionString);
SqlCommand sql_cmd = new SqlCommand(DeleteStr, cn);
cn.Open();
DataTable dtGetData = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(sql_cmd);
da.Fill(dtGetData);
if (dtGetData.Rows.Count > 0)
{
}
else
{
}
cn.Close();
cn.Dispose();
sql_cmd.Dispose();