Binding Data To Text Box

I want to bind some data to a text box from sql server db. but when i run the page i get an error. here is my code.

<form id="form1" runat="server">

<div>

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:imacsConn %>"

SelectCommand="SELECT Reportnumber FROM [SummaryBlue] WHERE REPORTNUMBER = @REPORTNUMBER">

<SelectParameters>

<asp:QueryStringParameter Name="REPORTNUMBER" QueryStringField="REPORTNo" Type="String" />

 

</SelectParameters>

</asp:SqlDataSource>

<asp:TextBox ID="TextBox1" runat="server" Columns="<%$ ConnectionStrings:imacsConn %>"></asp:TextBox></div>

</form>

 

Error:

Exception Details: System.FormatException: Input string was not in a correct format.

Source Error:





Line 25: </SelectParameters>
Line 26: </asp:SqlDataSource>
Line 27: <asp:TextBox ID="TextBox1" runat="server" Columns="<%$ ConnectionStrings:imacsConn %>"></asp:TextBox></div>
Line 28: </form>