Bill,
I'm not a MM expert, so I don't know if you can bind MM controls to a variable (I'm guessing you can't, but don't want to say for certain).
If you just want to stick with a variable, you can set the textbox' text property to the string, to get the string to display in the textbox. If you're allowing the user to edit the string, you'd need to examine the text property afterwards.
If you want to use binding, you have to declare the string as a property. Just as a simple example, let's say you declare the string as a property in the form...
private string _cText ;
public string cText
{
get {return _cText ;}
set {_cText = value;}
}
Then you assign cText the way you would any other property...
this.cText = "";
this.cText = Dr["mycolumn"]...
Then you can bind to your textbox like so...
myTextBox.DataBindings.Add("Text",this,"cText");
Hope that helps...
Kevin