C# variable in MySQL query

This is the variable:
public static StringBuilder MyStringBuilder2 = new StringBuilder(SPContext.Current.Web.CurrentUser.ToString());
 
This is the query:
<asp:SqlDataSource SelectCommand="SELECT DISTINCT
SOFTWARE.DISPLAY_NAME AS `Some of the Unautorized Programs`
FROM
SOFTWARE
Inner Join SOFTWARE_LABEL_JT ON SOFTWARE.ID = SOFTWARE_LABEL_JT.SOFTWARE_ID AND 1414= SOFTWARE_LABEL_JT.LABEL_ID
Inner Join MACHINE_SOFTWARE_JT ON SOFTWARE_LABEL_JT.SOFTWARE_ID = MACHINE_SOFTWARE_JT.SOFTWARE_ID
Inner Join MACHINE ON MACHINE_SOFTWARE_JT.MACHINE_ID = MACHINE.ID
WHERE
MACHINE.`USER` = variable"

                                              

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       <asp:SqlDataSource ID="EmployeesSqlDataSource"  
          SelectCommand="SELECT EmployeeID, LastName + ', ' + FirstName AS FullName FROM Employees" 
          ProviderName="System.Data.OleDb"
          Connectionstring="<%$ ConnectionStrings:NorthwindOleDbConnection %>" 
          RunAt="server">
        </asp:SqlDataSource>
 
 
        <asp:SqlDataSource ID="EmployeeDetailsSqlDataSource" 
          SelectCommand="SELECT EmployeeID, LastName, FirstName, Address, City, Region, PostalCode
                         FROM Employees WHERE EmployeeID = ?"
 
          InsertCommand="INSERT INTO Employees(LastName, FirstName, Address, City, Region, PostalCode)
                         VALUES (?, ?, ?, ?, ?, ?); 
                         SELECT @EmpID = SCOPE_IDENTITY()"
 
          UpdateCommand="UPDATE Employees SET LastName=?, FirstName=?, Address=?,
                           City=?, Region=?, PostalCode=?
                         WHERE EmployeeID=?"
 
          DeleteCommand="DELETE Employees WHERE EmployeeID=@original_EmployeeID"
 
          ProviderName="System.Data.OleDb"
          ConnectionString="<%$ ConnectionStrings:NorthwindOleDbConnection %>"
          OnInserted="EmployeeDetailsSqlDataSource_OnInserted"
          RunAt="server">
 
          <SelectParameters>
            <asp:ControlParameter ControlID="EmployeesDropDownList" PropertyName="SelectedValue"
                                  Name="EmpID" Type="Int32" DefaultValue="0" />
          </SelectParameters>
 
          <InsertParameters>
            <asp:Parameter Name="LastName"   Type="String" />
            <asp:Parameter Name="FirstName"  Type="String" />
            <asp:Parameter Name="Address"    Type="String" />
            <asp:Parameter Name="City"       Type="String" />
            <asp:Parameter Name="Region"     Type="String" />
            <asp:Parameter Name="PostalCode" Type="String" />
            <asp:Parameter Name="EmpID" Direction="Output" Type="Int32" DefaultValue="0" />
          </InsertParameters>
 
          <UpdateParameters>
            <asp:Parameter Name="LastName"   Type="String" />
            <asp:Parameter Name="FirstName"  Type="String" />
            <asp:Parameter Name="Address"    Type="String" />
            <asp:Parameter Name="City"       Type="String" />
            <asp:Parameter Name="Region"     Type="String" />
            <asp:Parameter Name="PostalCode" Type="String" />
            <asp:Parameter Name="original_EmployeeID" Type="Int32" DefaultValue="0" />
          </UpdateParameters>
 
          <DeleteParameters>
            <asp:Parameter Name="original_EmployeeID" Type="Int32" DefaultValue="0" />
          </DeleteParameters>
 
        </asp:SqlDataSource>
                                              

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<asp:Parameter DefaultValue="<%=HttpContext.Current.User.Identity.Name.ToString()%>" Name="UserNo" Type="String" /> 
                                              

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<asp:SqlDataSource runat="server" id="SqlDataSource2" ProviderName="System.Data.Odbc"  ConnectionString="Server=kbox;Database=ORG1;DSN=***;UID=***;PWD=***; port=3306;Option=3;" 
SelectCommand="SELECT
Count(SOFTWARE.DISPLAY_NAME),
MACHINE.`USER`
FROM
SOFTWARE
Inner Join SOFTWARE_LABEL_JT ON SOFTWARE.ID = SOFTWARE_LABEL_JT.SOFTWARE_ID AND 1413
= SOFTWARE_LABEL_JT.LABEL_ID
Inner Join MACHINE_SOFTWARE_JT ON SOFTWARE_LABEL_JT.SOFTWARE_ID = MACHINE_SOFTWARE_JT.SOFTWARE_ID
Inner Join MACHINE ON MACHINE_SOFTWARE_JT.MACHINE_ID = MACHINE.ID
WHERE
(MACHINE.USER_LOGGED = ?)
GROUP BY
MACHINE.`USER`
">
 
<SelectParameters>
  <asp:Parameter DefaultValue="<%=HttpContext.Current.User.Identity.Name%>.ToString()" Name="UserNo" Type="String" /> 
     </SelectParameters>
</asp:SqlDataSource>
                                              

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protected void Page_Load(object sender, EventArgs e)
{
 
	DataView dvSql = (DataView)SqlDataSource1.Select(DataSourceSelectArguments.Empty);
	foreach (DataRowView drvSql in dvSql)
	{
		Label1.Text = drvSql["MACHINE.USER_LOGGED"].ToString();
	}
 
	}
 
 
 
protected void SqlDataSource1_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{
	e.Command.Parameters["MACHINE.USER_LOGGED"].Value = "DOMAIN\\username";
}
                                              

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