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PODropdownlist data not insert in query
 

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    <p>I select the <code>DropDownList</code> value to insert in query but the value remains blank in query and due to empty value in where condition not any result outcome. I do with different tricks but remain empty</p> <pre><code>if (chkBoxChanl.Checked) { sql += " and channelName = '" + ddlChannel.Text + "' "; } if (chkBoxDate.Checked) { sql += " and transmissionDate_ between '" + tbFrom.Text + "' and '" + tbTo.Text + "'"; } if (chkBoxProgrm.Checked) { sql += " and programName ='" + ddlProgram.Text + "'"; } if (chkBoxParty.Checked) { sql += " and partiesName like '%" + ddlParty.SelectedValue + "%'"; } if (chkBoxPerson.Checked) { sql += " and personsName like '%" + ddlPerson.SelectedItem + "%'"; } if (chkBoxProvince.Checked) { sql += " and ProvinceName like '%" + ddlProvince.SelectedItem + "%'"; } if (chkBoxCity.Checked) { sql += " and CityName like '%" + ddlCity.Text + "%'"; } </code></pre> <p>Like</p> <ul> <li><code>ddlProgram.Text</code></li> <li><code>ddlProvince.SelectedItem</code></li> <li><code>ddlPerson.SelectedValue</code> selected <code>DropDownList</code> value is shown empty in query.</li> </ul> <p>What can I do to add the selected value in query? Please help me!</p> <p>I check that when I select the dropdownist values which come on first load then 2md time after press search button dropdownlist values empty and when I press search button it first run Page_Load function and if(!IspostBack) is execute then all dropdownlist selected values become empty which cause to empty values in where clause. Now I want that when I press search button dropdownlist values remain loaded which will resolve the issue to become enpty dropdownlist values. Please guide me further </p>
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    1. USMohsinjan110
    1. USMohsinjan110
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    1. COYou're open for Sql-Injection if you're allowing thee user to build your sql via TextBox. Use Sql-Parameters instead.
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      1. USTim Schmelter
    2. COhow I prevent my code from sql injection?
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      1. USMohsinjan110
    3. COBy using [`sql-parameters`](http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlparameter.aspx) (assuming you're using ado.net and sql-server as dbms).
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      1. USTim Schmelter
 

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