Report parameter with underscore not accepting in Reportviewer

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VS2008

C#

Visual-Studio

Hi all

I have loaded list of server name in dropdown (eg. 10.25.208.170_PLXWFDB2) while passing this value as a parameter to report viewer I am getting error like "The 'ServerName' parameter is missing a value".

When I check with getparameters() method the label field is having proper value like(10.25.208.170_PLXWFDB2) but value field is having the value (10.25.208.170) the values are truncated after underscore.

 combo1.Items.Add("10.25.208.167_PLXWFDB1");
 ReportParameter[] parm = new ReportParameter[1]
parm[0] = new ReportParameter("ServerName", combo1.SelectedItem.Text);
MyReportViewer.ServerReport.SetParameters(parm);
//here itself while setting ,value field is having the value (10.25.208.170)

Kindly help me. Can anyone help on this issue?

Thanks in advance